Inventor

Dewayne A. Spires

Inventor

Plaistow, NH, US

Overview

19→

Patents

1982–2005

Patent span

Electricity

Primary field (CPC H)

Patents· 19 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Mprimary

H04MTelephonic communication41%

H03FAmplifiers11%

G01RMeasuring electric variables7%

Y02DClimate change mitigation technologies in information and communication technologies [ict], i.e. information and communication technologies aiming at the reduction of their own energy use7%

G05FSystems for regulating electric or magnetic variables4%

H01FMagnets4%

H01HElectric switches4%

H03GControl of amplification4%

H03HImpedance networks, e.g. resonant circuits4%

H03KPulse technique4%

PatentTitleYear

6,940,969'Capacitor cancellation method and apparatus'2005 6,842,518'Frequency-dependent impedance synthesis for DSL interface circuits'2005 6,657,496'Amplifier circuit with regenerative biasing'2003 6,356,593'Data optimized codec'2002 6,169,425'Voltage sensing current foldback switch circuit'2001 5,974,363'Self-testing of smart line cards'1999 5,936,391'Partially temperature compensated low noise voltage reference'1999 5,881,129'Self-monitoring line interface circuit'1999 5,854,839'Dual voltage, self-monitoring line circuit'1998 5,848,149'Subscriber line interface and power circuit'1998 5,659,610'Battery feed circuit'1997 4,939,775'Telephone ringing detector'1990 4,896,093'Electronic inductor'1990 4,510,550'Relay driver'1985 4,503,289'Line circuit with flux compensation and active impedance termination'1985 4,477,780'Operational amplifier with multiple switchable outputs'1984 4,476,350'Battery feed circuit'1984 4,454,479'Operational amplifier with improved output capability'1984 4,323,885'Noise and crosstalk reduction in mid-riser biased encoders'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982–1984Patents assigned to BELL TELEPHONE LABOR INC (3)· patent assignee history

1982–2005Based in Plaistow, NH, US· patent location history

1984–1990Patents assigned to AT & T BELL LAB (5)· patent assignee history

1990Patents assigned to AMERICAN TELEPHONE & TELEGRAPH (1)· patent assignee history

1997–2002Patents assigned to LUCENT TECHNOLOGIES INC (7)· patent assignee history

2003–2005Patents assigned to LEGERITY INC (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
LUCENT TECHNOLOGIES INC	7	1997–2002
AT & T BELL LAB	5	1984–1990
BELL TELEPHONE LABOR INC	3	1982–1984
LEGERITY INC	3	2003–2005
AMERICAN TELEPHONE & TELEGRAPH	1	1990

Locations

Location	Patents	Span
Plaistow, NH, US	19	1982–2005