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Class Information
Number: 455/331
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Frequency modifying or conversion > Particular frequency conversion structure or circuitry > Crystal or electron tube diode
Description: Systems and in which the frequency conversion means consists of crystal or other type (e.g., electron tube) diode devices of the two terminal or electrode type. The diodes may be of passive rectifier type or active such as a negative resistance (e.g., tunnel or Esaki diode).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7587224 |
Reconfigurable topology for receiver front ends |
Sep. 8, 2009 |
| 7376403 |
Terahertz radiation mixer |
May. 20, 2008 |
| 6317590 |
Mixer for a receiver |
Nov. 13, 2001 |
| 6205324 |
Broadband double-balanced frequency mixer |
Mar. 20, 2001 |
| 6192229 |
Diode mixer circuit |
Feb. 20, 2001 |
| 5974307 |
Method and system communicating with a voice response unit over a cellular telephone network |
Oct. 26, 1999 |
| 5729197 |
Automatic, self-triggering alarm processing system and method |
Mar. 17, 1998 |
| 5600705 |
Method for call establishment |
Feb. 4, 1997 |
| 5301223 |
Cellular telephone system with remote programming, voice responsive registration and real time billing |
Apr. 5, 1994 |
| 4878029 |
Complex digital sampling converter for demodulator |
Oct. 31, 1989 |
| 4658440 |
Single balanced self-oscillating dual gate FET mixer |
Apr. 14, 1987 |
| 4637070 |
UHF mixing circuit having .pi. configured impedance converter |
Jan. 13, 1987 |
| 4340975 |
Microwave mixing circuit and a VHF-UHF tuner having the mixing circuit |
Jul. 20, 1982 |
| 4317231 |
Microwave circuit for a parametric upper sideband down converter |
Feb. 23, 1982 |
| 4287603 |
Radiated input mixer |
Sep. 1, 1981 |
| 4270224 |
Microwave down converter |
May. 26, 1981 |
| 4249263 |
Mixer circuit |
Feb. 3, 1981 |
| 4245355 |
Microwave frequency converter |
Jan. 13, 1981 |
| 4224572 |
Broadband doubly balanced mixer having improved termination insensitivity characteristics |
Sep. 23, 1980 |
| 4204168 |
Signal converter using a quad diode race |
May. 20, 1980 |
| 4163944 |
Compensation circuit for an electrical signal mixer |
Aug. 7, 1979 |
| 4163232 |
Dual mode microwave mixer |
Jul. 31, 1979 |
| 4158817 |
Microwave input circuit with parametric down converter |
Jun. 19, 1979 |
| 4152653 |
Integrated mixer arrangement |
May. 1, 1979 |
| 4119914 |
Double balanced mixer using single ferrite core |
Oct. 10, 1978 |
| 4112374 |
Doubly balanced mixer with optimized dynamic range |
Sep. 5, 1978 |
| 4104594 |
Modified A. M. detector |
Aug. 1, 1978 |
| 4099126 |
Frequency converter apparatus |
Jul. 4, 1978 |
| 4079321 |
Dual diode high conversion efficiency signal mixer |
Mar. 14, 1978 |
| 4063176 |
Broadband high frequency mixer |
Dec. 13, 1977 |
| 4052785 |
Method of making a transformer assembly |
Oct. 11, 1977 |
| 4035732 |
High dynamic range receiver front end mixer requiring low local oscillator injection power |
Jul. 12, 1977 |
| 4032850 |
Coaxial balun with doubly balanced heterodyne converter |
Jun. 28, 1977 |
| 4006425 |
Dielectric image guide integrated mixer/detector circuit |
Feb. 1, 1977 |
| 3992674 |
Balanced dual output mixer circuit |
Nov. 16, 1976 |
| 3983489 |
Doubling mixer |
Sep. 28, 1976 |
| 3973204 |
YIG tuned mixer |
Aug. 3, 1976 |
| 3937979 |
Photoparametric amplifying upconverter |
Feb. 10, 1976 |
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