Patent US1744823A successfully refreshed from Google Patents.
US1744823A
Expired / Lapsed
US
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Door-operating mechanism
Assignee: Haughton Elevator & Machine Co
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Filing: 1927-04-11
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Granted: 1930-01-28
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Expires: 1947-04-11
Abstract
No abstract record available.
Inventors
- 👤 John A Brubaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:49
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/665; E05F15/668; E05F15/678; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/106
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) | 1933-01-27 | 1933-07-29 | 1934-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-01-27 | 1937-07-29 | 1938-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-01-27 | 1941-07-29 | 1942-01-28 | $7700.00 | Window Closed / Lapsed |