Patent US2931723A successfully refreshed from Google Patents.
US2931723A
Expired / Lapsed
US
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Photographic reproduction of multiple wedge scanner
Assignee: Northrop Grumman Corp
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Filing: 1953-09-01
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Granted: 1960-04-05
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Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 Walter M Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:56
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02; G01; G01C; G01C25/00
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |