US1668644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving staircase of the ascending and descending type
Assignee: ANCIENS ETS GROSSELIN
•
Filing: 1925-05-22
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Granted: 1928-05-08
•
Expires: 1945-05-22
Abstract
No abstract record available.
Inventors
- 👤 Hocquart Edouard
- 👤 Hugoniot Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:51
CPC Classifications
B; B66; B66B; B66B21/00; B66B21/02; B66B21/04
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) | 1931-05-08 | 1931-11-07 | 1932-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-05-08 | 1935-11-07 | 1936-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-05-08 | 1939-11-07 | 1940-05-08 | $7700.00 | Window Closed / Lapsed |