US1911792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for operating the doors of elevator installations
Assignee: Otis Elevator Co
•
Filing: 1929-01-29
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Granted: 1933-05-30
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Expires: 1949-01-29
Abstract
No abstract record available.
Inventors
- 👤 Franz A Boedtcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:56
CPC Classifications
B; B66; B66B; B66B13/00; B66B13/02; B66B13/06; B66B13/08; B66B13/12; B66B13/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-05-29 | 1936-11-28 | 1937-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-05-29 | 1940-11-28 | 1941-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-05-29 | 1944-11-28 | 1945-05-30 | $7700.00 | Window Closed / Lapsed |