Patent US720891A successfully refreshed from Google Patents.
US720891A
Expired / Lapsed
US
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Folding ladder.
Assignee: Hoskins & Son Ltd
•
Filing: 1902-09-18
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Granted: 1903-02-17
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Expires: 1922-09-18
Abstract
No abstract record available.
Inventors
- 👤 Arthur Neville Chamberlain
- 👤 William Langley Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:58
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/387
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) | 1906-02-16 | 1906-08-18 | 1907-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-02-16 | 1910-08-18 | 1911-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-02-16 | 1914-08-18 | 1915-02-17 | $7700.00 | Window Closed / Lapsed |