Inventor
Adrian J. DeVries
Inventor
Elmhurst, IL, US
Overview
Patents· 15 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H03Hprimary
H03HImpedance networks, e.g. resonant circuits59%
H04NPictorial communication, e.g. television29%
G06GAnalogue computers6%
Y10TTechnical subjects covered by former us classification6%
PatentTitleYear
5,446,795'Universal decoder for television signal scramble systems'19955,235,640'Master decoder for television signal scramble systems'19934,903,297'Restricted access television transmission system'19904,825,467'Restricted access television transmission system'19894,485,364'Reflection-compensated surface acoustic wave transducer'19844,460,995'Narrow focus compensating transducer for surface acoustic wave filter'19844,410,823'Surface acoustic wave device employing reflectors'19834,375,624'Surface wave acoustic device with compensation for spurious frequency response modes'19834,336,515'Acoustic filter with harmonic rejection'19824,333,065'Low reflectivity apodized surface acoustic transducer with means to prevent wavefront distortion'19824,099,146'Acoustic wave storage convolver'19784,065,789'Surface wave device for use in a ghost cancellation system'19774,004,254'Swif with side lobe compensation barrier'19773,988,703'Acoustic surface wave device having split-isolated or split-connected multistrip coupler'19763,987,379'Acoustic surface wave filter having combined split-isolated and split-connected coupler'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1984Patents assigned to ZENITH RADIO CORP (10)· patent assignee history
1976–1978Based in Elmhurst, IL, US· patent location history
1982–1984Based in Mount Prospect, IL, US· patent location history
1983Based in Kennewick, WA, US· patent location history
1984Patents assigned to ZENITH ELECTRONICS CORP (1)· patent assignee history
1984Based in Richland, WA, US· patent location history
1989–1995Patents assigned to INT TELESYSTEMS INC (4)· patent assignee history
1989–1995Based in Aurora, IL, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| ZENITH RADIO CORP | 10 | 1976–1984 |
| INT TELESYSTEMS INC | 4 | 1989–1995 |
| ZENITH ELECTRONICS CORP | 1 | 1984 |
Locations
| Location | Patents | Span |
|---|---|---|
| Elmhurst, Illinois, US | 5 | 1976–1978 |
| Aurora, Illinois, US | 4 | 1989–1995 |
| Mount Prospect, Illinois, US | 4 | 1982–1984 |
| Richland, Washington, US | 1 | 1984 |
| Kennewick, Washington, US | 1 | 1983 |