Patent US2973438A successfully refreshed from Google Patents.
US3536376A
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Optical modulation apparatus having a phase retarding spatial filter
Assignee: Raytheon Co
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Filing: 1968-03-06
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Granted: 1970-10-27
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Expires: 1988-03-06
Abstract
No abstract record available.
Inventors
- 👤 Harley Barry Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:16
CPC Classifications
G; G02; G02F; G02F1/00; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G02F1/01; G02F1/11; G06; G06E; G06E3/00; G06E3/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |