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US2670890A
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Emergency escape elevator for derricks
Assignee: Individual
•
Filing: 1950-01-06
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Granted: 1954-03-02
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Expires: 1970-01-06
Abstract
No abstract record available.
Inventors
- 👤 Sidney P Hodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:51
CPC Classifications
A; A62; A62B; A62B1/00; A62B1/02; E; E21; E21B; E21B15/00; Y; Y10; Y10T; Y10T292/00; Y10T292/42; Y10T292/438
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US688436A
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US909794A
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US2567278A
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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) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |