Patent US2850115A successfully refreshed from Google Patents.
US2850115A
Expired / Lapsed
US
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Door operating mechanism
Assignee: Otis Elevator Co
•
Filing: 1953-01-26
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Granted: 1958-09-02
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Expires: 1973-01-26
Abstract
No abstract record available.
Inventors
- 👤 Bruns William Henry
- 👤 Karmel Philip
- 👤 Jr Benjamin Whitehead Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:17
CPC Classifications
B; B66; B66B; B66B13/00; B66B13/24; B66B13/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1249188A
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US1698362A
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US1721967A
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US1934590A
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US1823962A
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US1982442A
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US2235380A
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US2235381A
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US2432293A
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US2601250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |