Inventor
Richard C. Calderwood
Inventor
Portland, OR, US
Overview
Patents· 12 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H04Rprimary
H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers40%
G06FElectric digital data processing13%
H04NPictorial communication, e.g. television13%
F01LCyclically operating valves for machines or engines7%
F02DControlling combustion engines7%
G01SRadio direction-finding7%
G08BSignalling systems, e.g. personal calling systems7%
Y02TClimate change mitigation technologies related to transportation7%
PatentTitleYear
7,492,918'Audio speaker with graduated voice coil windings'20097,456,868'Digital camera with ISO pickup sensitivity adjustment'20087,233,681'Electromagnetic transducer with eccentrically mounted voice coil former'20077,227,970'Shorting ring fixture for electromagnetic transducer'20077,180,429'Slow motion detection system'20077,181,039'Thermal chimney equipped audio speaker cabinet'20077,177,440'Electromagnetic transducer with asymmetric diaphragm'20077,063,059'Piston engine with selectable firing order'20067,006,654'Push-pull electromagnetic transducer with increased Xmax'20066,442,607'Controlling data transmissions from a computer'20026,266,773'Computer security system'20015,978,737'Method and apparatus for hazard detection and distraction avoidance for a vehicle'1999Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1999–2007Patents assigned to INTEL CORP (4)· patent assignee history
1999–2009Based in Portland, OR, US· patent location history
2006–2009Patents assigned to STEP TECHNOLOGIES INC (6)· patent assignee history
2006–2008Patents assigned to CALDERWOOD RICHARD C (2)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| STEP TECHNOLOGIES INC | 6 | 2006–2009 |
| INTEL CORP | 4 | 1999–2007 |
| CALDERWOOD RICHARD Cself | 2 | 2006–2008 |
Locations
| Location | Patents | Span |
|---|---|---|
| Portland, OR, US | 12 | 1999–2009 |