US2678583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gimbaled diaphragm for optical projection photogrammetric plotting instruments
Assignee: HARRY T KELSH
•
Filing: 1952-04-18
•
Granted: 1954-05-18
•
Expires: 1972-04-18
Abstract
No abstract record available.
Inventors
- 👤 Knapik John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:03
CPC Classifications
G; G01; G01C; G01C11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US154607A
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US2324133A
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US1889042A
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US2079090A
Cited
US2285768A
Cited
US2374981A
Cited
US2492870A
Cited
US2552975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |