US2633050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical plummet
Assignee: Keuffel and Esser Co
•
Filing: 1949-10-01
•
Granted: 1953-03-31
•
Expires: 1969-10-01
Abstract
No abstract record available.
Inventors
- 👤 Allister L Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:44
CPC Classifications
G; G01; G01C; G01C1/00; G01C1/02; G12; G12B; G12B5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1722209A
Cited
US928477A
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US940329A
Cited
US973062A
Cited
US1121309A
Cited
GB141850A
Cited
US1448289A
Cited
US1891641A
Cited
GB431371A
Cited
US2193512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |