Patent Details

New patents added: 29 September 2000 more coming soon...

Last patent image update : 36 patent images added, 18 June 2001

Special Thanks to Karen Newton for typing these patents,

and to Hilary Tugwood for the typing that she did.

My thanks also to James Boyk, California Institute of Technology for suggesting this page.

Below you will find a list of all of Alan Blumleins' 128 Patents listed by patent number.
Next to each is a brief description of the patent.

Use the Patent Number as a link to the detailed file for each of the patents.
Please note that a ' Y ' in the far right column indicates that Patent Images have been uploaded.

1 291,511 Improvements relating to loaded telephone circuits and particularly to the reduction of cross-tall therein
Y
2 323,037 Alternating current bridge circuits
Y
3 334,652 Improvements in telephone and like transmission systems
Y
4 335,935 Composite signaling system
Y
5 337,134 Improvements in submarine cable signaling systems
Y
6 338,588 Improvements in or relating to variable mutual inductances
Y
7 350,954 Improvements in electro-mechanical sound recording devices more especially of the moving coil type  
8 350,998 Improvements in apparatus for recording sounds upon wax or other like discs or blanks  
9 357,229 Terminal shield for submarine cable  
10 361,468 Improvements in sound reproducing and recording devices  
11 362,472 Improvements in electrical transmission devices  
12 363,627 Improvements in or relating to apparatus for the interconversion of electrical and mechanical energy such as used in sound recording or reproducing apparatus  
13 368,336 Improvements in and relating to the mounting of pivoted apparatus such as electrical sound recording devices  
14 369,063 Improvements in electro-acoustic devices  
15 394,325 Improvements in and relating to sound-transmission, sound-recording and sound-reproduction systems
Y
16 400,976 Improvements relating to oscillatory electric circuits such as may be used for example in connection with cathode ray devices  
17 402,483 Improvements in electric coils  
18 417,718 Improvements in or relating to vibratory devices such, for example, as are used in the electrical recording or reproduction of sound  
19 419,284 Improvements in and relating to inductance coils and the like for use in radio-frequency current circuits  
20 421,546 Improvements in or relating to the supply of electrical energy to varying loads for example to thermionic valve apparatus  
21 422,914 Improvements in or relating to television and the like apparatus  
22 425,553 Improvements in or relating to thermionic valve amplifiers  
23 429,022 Improvements in and relating to sound-transmission, sound-recording and sound-reproduction systems  
24 429,054 Improvements in and relating to sound-transmission, sound-recording and sound-reproduction systems  
25 432,485 Improvements in or relating to television and the like systems employing cathode ray tubes  
26 432,978 Improvements in or relating to directional wireless aerial systems  
27 434,876 Improvements in or relating to television and the like systems  
28 436,734 Improvements in or relating to electrical amplifiers such as may be used for example in television  
29 445,968 Improvements in or relating to aerial systems  
30 446,661 Improvements in or relating to television transmitting systems  
31 446,663 Improvements in or relating to television systems  
32 447,754 Improvements in or relating to insulated electrical conductors  
33 447,824 Improvements in or relating to the manufacture of insulated electrically conductive screens more particularly for use in cathode ray tubes  
34 448,421 Improvements in or relating to thermionic valve circuits  
35 449,242 Improvements in apparatus for amplifying electrical variations  
36 449,533 Improvements in or relating to coils for producing a magnetic field of approximately uniform flux density for use for example with cathode ray tubes  
37 452,713 Improvements in cable suitable or the transmission of high frequency electric currents  
38 452,772 Improvements in cable suitable or the transmission of high frequency electric currents  
39 452,791 Improvements in or relating to directional wireless aerial systems  
40 455,492 Improvements in or relating to electric signal transmission lines  
41 455,858 Improvements in or relating to the transmission of impulses of different kinds over a common channel for example in television and like systems  
42 456,135 Improvements in or relating to television and like transmitting systems  
43 456,444 Improvements in and relating to electrical sound transmission systems  
44 458,585 Improvements in and relating to the transmission of electrical signals having a direct current component  
45 461,004 Improvements in or relating to apparatus for the supply of electrical energy to varying loads  
46 461,324 Improvements in or relating to high frequency electric transmission lines  
47 462,530 Improvements in or relating to electric circuits for reducing the effective shunt capacity introduced by circuit elements such as for example electric batteries  
48 462,583 Improvements in or relating to the reduction of the effects of unwanted reactance introduced in electric circuit arrangements by certain circuit elements  
49 462,584 Improvements in or relating to electric circuits for reducing the effective shunt capacity introduced by circuit elements such as for example electric batteries  
50 462,823 Improvements in or relating to the supply of electrical energy to varying loads for example thermionic valve apparatus  
51 463,111 Improvements in or relating to frequency selective electric cables  
52 464,443 Improvements in or relating to aerial systems  
53 466,418 Improvements in or relating to electric signal transmission systems  
54 470,408 Improvements in or relating to electric signal transmission lines  
55 470,495 Improvements in or relating to multiplex signaling systems  
56 473,276 Improvements in or relating to rectifiers for alternating current  
57 474,607 Improvements in or relating to electric smoothing circuit arrangements  
58 475,729 Improvements in or relating to voltage regulating systems  
59 476,935 Improvements in or relating to television systems  
60 477,392 Improvements in or relating to alternating current measuring instruments  
61 479,113 Improvements in or relating to thermionic valve circuits particularly for use in television  
62 479,599 Improvements in or relating to modulated carrier wave receivers  
63 480,355 Improvements in or relating to high tension supply circuits for electron discharge devices  
64 482,195 Improvements in or relating to electromagnetic deflecting coils for cathode ray tubes  
65 482,370 Improvements in or relating to oscillatory electric circuits  
66 482,740 Improvements in or relating to thermionic valve amplifying circuit arrangements  
67 483,650 Improvements in or relating to electromagnetic deflecting coils for cathode ray tubes  
68 489,950 Improvements in or relating to thermionic valve and other electric circuits  
69 490,150 Improvements in or relating to television systems  
70 490,205 Improvements in or relating to television transmitting apparatus  
71 491,490 Improvements in or relating to impedance networks for coupling electric cable circuits  
72 495,724 Improvements in or relating to television receiving systems  
73 496,139 Improvements in or relating to alternating current machines  
74 496,883 Improvements in or relating to thermionic valve amplifying circuits  
75 497,060 Improvements in or relating to thermionic amplifiers  
76 501,966 Improvements in or relating to television systems  
77 503,555 Improvements in or relating to television transmitting and receiving systems  
78 503,765 Improvements in or relating to electric cables  
79 505,079 Improvements in or relating to wireless transmission or receiving apparatus  
80 505,480 Improvements in or relating to thermionic valve circuits  
81 507,239 Improvements in or relating to the transmission or reception of electrical signals  
82 507,417 Improvements in or relating to radio receivers  
83 507,665 Improvements in or relating to thermionic valve voltmeter and potentiometer circuits and the like  
84 508,377 Improvements in or relating to television or other signal transmission systems  
85 512,109 Improvements in or relating to television or other signal transmission systems  
86 514,065 Improvements in or relating to thermionic valve circuits  
87 514,825 Improvements in or relating to protective devices in connection with high voltage electrical discharge apparatus  
88 515,044 Improvements in or relating to circuit arrangements embodying cathode ray oscillographs  
89 515,348 Improvements in or relating to signal amplifying systems  
90 515,360 Improvements in or relating to television or other signal transmission systems  
91 515,361 Improvements in or relating to the transmission of electrical signals having a direct current component  
92 515,362 Improvements in or relating to the transmission of electrical signals having a direct current component  
93 515,364 Improvements in or relating to the transmission of electrical signals  
94 515,684 Improvements in or relating to high frequency electrical conductors or radiators  
95 517,516 Improvements in or relating to electric wave transmission networks  
96 520,646 Improvements in or relating to television transmitting tubes  
97 528,310 Improvements in or relating to thermionic valve circuits  
98 529,590 Improvements in or relating to thermionic valve amplifiers  
99 534,465 Improvements in or relating to magnetic focussing arrangements for cathode ray tubes  
100 536,089 Improvements in or relating to thermionic valve amplifiers  
101 541,942 Improvements in or relating to bridge arrangements for the comparison of electrical resistances  
102 543,602 Improvements in or relating to electrical phase or time delay indicating or controlling circuits  
103 554,715 Improvements in or relating to apparatus for modulating the frequency of electrical oscillations  
104 563,464 Improvements in or relating to thermionic valve oscillators  
105 567,227 Improvements in or relating to multiple contact electric switches  
106 574,133 Improvements in or relating to circuit arrangements for generating electrical waveforms  
107 574,708 Improvements in or relating to electron discharge devices  
108 577,817 Improvements in or relating to electrical supply apparatus  
109 577,942 Improvements in or relating to apparatus for generating electrical pulses  
110 579,154 Improvements in or relating to the detection and/or observation of reflecting objects by means of radiation  
111 579,725 Improvements in or relating to pulse generating thermionic valve apparatus  
112 580,527 Improvements in or relating to electrical circuit arrangements for effecting integration and applications thereof  
113 581,161 Improvements in methods and apparatus for the measurement of small capacities and applications thereof  
114 581,164 Improvements in or relating to electrical bridge arrangements  
115 581,167 Improvements in or relating to high frequency electric circuit arrangements  
116 581,561 Improvements in or relating to pulse generating thermionic valve apparatus  
117 581,920 Improvements in or relating to methods and apparatus for determining the direction or position of sources or reflectors of radiant energy  
118 582,503 Improvements in or relating to pulse signal selecting and indicating systems  
119 585,789 Improvements in or relating to self-balancing bridge arrangements  
120 585,906 Improvements in or relating to methods and apparatus for determining the direction or position of sources or reflectors of radiant energy  
121 585,907 Improvements in or relating to methods and apparatus for reducing the effect of interference in the observation of recurrent oscillatory signals  
122 585,908 Improvements in or relating to methods and apparatus for modifying recurrent signals and applications thereof  
123 587,562 Improvements in or relating to apparatus for the reception of modulated oscillations  
124 587,878 Improvements in or relating to electrical bridge arrangements  
125 589,127 Improvements in or relating to apparatus for generating electrical impulses  
126 589,228 Improvements in or relating to apparatus for the control of the timing of recurrent signals  
127 589,229 Improvements in or relating to radio receivers and application thereof  
128 595,509 Improvements in or relating to Electric Oscillation Generators  

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