Inventor
Chun-Foong Cheah
Inventor
San Francisco, CA, US
Overview
Patents· 4 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Nprimary
G01NInvestigating or analysing materials by determining their chemical or physical properties25%
F02DControlling combustion engines13%
G01CMeasuring distances, levels or bearings13%
G05FSystems for regulating electric or magnetic variables13%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems13%
Y02TClimate change mitigation technologies related to transportation13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%
PatentTitleYear
5,428,902'Inclinometer sensing circuitry and operation'19955,343,156'IC for producing an output voltage related to fuel composition in a capacitive fuel sensor'19945,231,358'Capacitive fuel composition sensor with slow oscillator and high speed switch'19935,066,901'Transient protected isolator output stage'1991Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1991–1994Patents assigned to NAT SEMICONDUCTOR CORP (3)· patent assignee history
1991Based in Sunnyvale, CA, US· patent location history
1993Patents assigned to GEN MOTORS CORP (1)· patent assignee history
1993–1994Based in San Francisco, CA, US· patent location history
1995Patents assigned to PRECISION NAVIGATION INC (1)· patent assignee history
1995Based in Foster City, CA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| NAT SEMICONDUCTOR CORP | 3 | 1991–1994 |
| GEN MOTORS CORP | 1 | 1993 |
| PRECISION NAVIGATION INC | 1 | 1995 |
Locations
| Location | Patents | Span |
|---|---|---|
| San Francisco, California, US | 2 | 1993–1994 |
| Foster City, California, US | 1 | 1995 |
| Sunnyvale, California, US | 1 | 1991 |