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US2481124A
Expired / Lapsed
US
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Door-operating mechanism for lift doors and the like
Assignee: EXPRESS LIFT Co Ltd
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Filing: 1945-09-08
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Granted: 1949-09-06
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Expires: 1965-09-08
Abstract
No abstract record available.
Inventors
- 👤 Kruger Seraphim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:18
CPC Classifications
B; B66; B66B; B66B13/00; B66B13/02; B66B13/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-05 | 1953-03-07 | 1953-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-05 | 1957-03-07 | 1957-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-05 | 1961-03-07 | 1961-09-06 | $7700.00 | Window Closed / Lapsed |