Dewayne A. Spires — 19 Patents at AT&T

Dewayne A. Spires has been granted 19 US patents while listed as an inventor at AT&T. The first was granted in 1982 and the most recent in September 2005. Dewayne A. Spires ranks #229,345 of 4,157,543 US inventors in our database (top 5.5%). Patent records list Dewayne A. Spires in Plaistow, NH, US.

Issued Patents All Time

Showing 1–19 of 19 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
6940969	Capacitor cancellation method and apparatus	Robert Chen, John Gammel	2005-09-06
6842518	Frequency-dependent impedance synthesis for DSL interface circuits	Robert Chen, John Gammel	2005-01-11
6657496	Amplifier circuit with regenerative biasing	Robert Chen, John Gammel, Joseph H. Havens	2003-12-02
6356593	Data optimized codec	Nuri Ruhi Dagedeviren, Lynn Emery Ditty, Donald L. Duttweiler, Gerard Pepenella	2002-03-12	$18,604,000
6169425	Voltage sensing current foldback switch circuit	Dean M. Umberger	2001-01-02	$28,454,000
5974363	Self-testing of smart line cards	John Gammel, Christine Mary Gervesh, Randy Lee Hafer, Ronald Joseph Rees, Robert Vaiden, II	1999-10-26	$85,525,000
5936391	Partially temperature compensated low noise voltage reference	Frode Larsen, Douglas G. Marsh	1999-08-10	$64,036,000
5881129	Self-monitoring line interface circuit	Robert Chen, John Gammel	1999-03-09
5854839	Dual voltage, self-monitoring line circuit	Robert Chen, John Gammel	1998-12-29	$116,665,000
5848149	Subscriber line interface and power circuit	Robert Chen, Paul W. Frazier, John Gammel, Andrew Marsh, Apurba Roy	1998-12-08	$52,365,000
5659610	Battery feed circuit	Ian A. Schorr	1997-08-19	$14,371,000
4939775	Telephone ringing detector	Kenneth Houck	1990-07-03
4896093	Electronic inductor	—	1990-01-23
4510550	Relay driver	—	1985-04-09
4503289	Line circuit with flux compensation and active impedance termination	—	1985-03-05
4477780	Operational amplifier with multiple switchable outputs	—	1984-10-16
4476350	Battery feed circuit	Denis W. Aull	1984-10-09
4454479	Operational amplifier with improved output capability	—	1984-06-12
4323885	Noise and crosstalk reduction in mid-riser biased encoders	Joseph F. Carriere, Wilmer B. Gaunt, Jr., Joseph Elide Landry	1982-04-06	$15,656,000

Dewayne A. Spires — 19 Patents

Issued Patents All Time

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