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Class Information
Number: 327/568
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > Negative resistance type
Description: Subject matter wherein an electron space discharge device or a solid-state device included in the nonlinear circuit has a negatively sloped portion in its current-voltage characteristic plot in which an increase in voltage results in a decrease in current.

Sub-classes under this class:

Class Number Class Name Patents
327/570 Having "n"-shape curve on i-v plot (e.g., tunnel diode type, etc.) 27
327/571 Having "s"-shape curve on i-v plot (e.g., pnpn diode type, etc.) 5
327/572 Secondary emissive type 2
327/569 Unijunction transistor 4

Patents under this class:

Patent Number Title Of Patent Date Issued
7023264 Nonlinear resistor circuit using floating gate MOSFETs Apr. 4, 2006
7012833 Integrated circuit having negative differential resistance (NDR) devices with varied peak-to-valley ratios (PVRs) Mar. 14, 2006
6777982 Molecular scale latch and associated clocking scheme to provide gain, memory and I/O isolation Aug. 17, 2004
6621331 Variable negative resistance cell for bipolar integrated circuits Sep. 16, 2003
6225860 Source voltage detecting circuit May. 1, 2001
5930323 Ultra fast shift register using resonant tunnel diodes Jul. 27, 1999
5770958 Periodic waveform generating circuit Jun. 23, 1998
5537076 Negative resistance circuit and inverter circuit including the same Jul. 16, 1996
5519348 Sense circuit, memory circuit, negative-resistance circuit, schmitt trigger, load circuit, level shifter, and amplifier May. 21, 1996
5514986 Sense circuit, memory circuit, negative-resistance circuit, schmitt trigger, load circuit, level shifter, and amplifier May. 7, 1996
5504442 Sense circuit Apr. 2, 1996
5489874 Inverting amplifier having negative-resistance circuit Feb. 6, 1996
5479129 Variable propagation delay digital signal inverter Dec. 26, 1995
5444751 Tunnel diode shift register utilizing tunnel diode coupling Aug. 22, 1995
5430407 Voltage squarer using backward diodes Jul. 4, 1995
5304858 Apparatus for maintaining a low power loss within an input stage for digital signals Apr. 19, 1994
4902912 Apparatus including resonant-tunneling device having multiple-peak current-voltage characteristics Feb. 20, 1990
4623850 Vital code generating circuit Nov. 18, 1986
4419638 Negative resistance element Dec. 6, 1983
4413227 Negative resistance element Nov. 1, 1983
4384300 Negative resistance device May. 17, 1983
4182964 Negative resistance element circuit combinations Jan. 8, 1980
4086501 Planar transferred electron logic device with improved biasing means Apr. 25, 1978
4028562 Negative impedance transistor device Jun. 7, 1977
4025729 Telephone ringing control circuits May. 24, 1977
4015146 Negative resistance network Mar. 29, 1977
T955006 Delay circuits using negative resistance CMOS circuits Feb. 1, 1977
3989962 Negative-resistance semiconductor device Nov. 2, 1976
3987381 Electronic controllable negative resistance arrangement Oct. 19, 1976

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