Inventor

Charles A. Walton

Inventor

Los Gatos, CA, US

Overview

1976–2020

Patent span

Physics

Primary field (CPC G)

Patents· 29 as inventor

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

G06Kprimary

G06KGraphical data reading23%

G07CTime or attendance registers21%

G07FCoin-freed or like apparatus7%

G01SRadio direction-finding4%

H04BTransmission4%

A61BDiagnosis3%

A63BApparatus for physical training, gymnastics, swimming, climbing, or fencing3%

A63FCard, board, or roulette games3%

G06QInformation and communication technology [ict] specially adapted for administrative, commercial, financial, managerial or supervisory purposes3%

G08GTraffic control systems3%

PatentTitleYear

10,873,853Systems and methods for managing digital identities associated with users2020 6,742,714'Proximity card with incorporated PIN code protection'2004 6,590,536'Body motion detecting system with correction for tilt of accelerometers and remote measurement of body position'2003 6,340,116'Proximity card with incorporated pin code protection'2002 5,989,157'Exercising system with electronic inertial game playing'1999 5,896,215'Multi-channel system with multiple information sources'1999 5,342,116'Programmer\'s anti-slump chair with knee support'1994 5,159,332'Proximity identification system with flux concentration in operating region'1992 5,022,099'Radiation helmet'1991 5,021,778'Capacitance coupled proximity identification system'1991 4,980,539'Portable warmer'1990 4,918,416'Electronic proximity identification system'1990 4,888,474'Proximity identification system with lateral flux magnetic rod coupling'1989 4,782,342'Proximity identification system with lateral flux paths'1988 4,656,472'Proximity identification system with power aided identifier'1987 4,654,658'Identification system with vector phase angle detection'1987 4,600,829'Electronic proximity identification and recognition system with isolated two-way coupling'1986 4,580,041'Electronic proximity identification system with simplified low power identifier'1986 4,546,241'Electronic proximity identification system'1985 4,473,825'Electronic identification system with power input-output interlock and increased capabilities'1984 4,459,474'Identification system with separation and direction capability and improved noise rejection'1984 4,388,524'Electronic identification and recognition system with code changeable reactance'1983 4,384,288'Portable radio frequency emitting identifier'1983 4,307,728'Portable device for measuring heartbeat rate with compensation for extraneous signals'1981 4,236,068'Personal identification and signaling system'1980 4,223,830'Identification system'1980 4,202,350'Device for measuring pulse, breathing and running rate for joggers'1980 4,142,674'Recognition and identification key having adaptable resonant frequency and methods of adapting same'1979 3,970,824'Electronic recognition and identification system for identifying a family of codes'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1979Patents assigned to SCHLAGE ELECTRONICS INC (2)· patent assignee history

1976–2004Based in Los Gatos, CA, US· patent location history

1980–1994Patents assigned to WALTON CHARLES A (20)· patent assignee history

1990Patents assigned to SIELOX SYSTEMS INC (1)· patent assignee history

2020Patents assigned to MASTERCARD INTERNATIONAL INC (1)· patent assignee history

2020Based in Marshfield, MA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
WALTON CHARLES Aself	20	1980–1994
SCHLAGE ELECTRONICS INC	2	1976–1979
MASTERCARD INTERNATIONAL INC	1	2020
SIELOX SYSTEMS INC	1	1990

Locations

Location	Patents	Span
Los Gatos, California, US	28	1976–2004
Marshfield, Massachusetts, US	1	2020