US2508286A
Expired / Lapsed
US
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Assignee: Otis Engineering Corp
•
Filing: 1945-12-15
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Granted: 1950-05-16
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Expires: 1965-12-15
Abstract
No abstract record available.
Inventors
- 👤 Herbert C Otis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:31
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1898261A
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US2305062A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |