Patent US3424512A successfully refreshed from Google Patents.
US3424512A
Expired / Lapsed
US
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Optical spatial filtering with enlarged frequency spectrum plane
Assignee: Conductron Corp
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Filing: 1964-04-27
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Granted: 1969-01-28
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Expires: 1984-04-27
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Ingalls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/46; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2929922A
Cited
US3240108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |