Patent US987585A successfully refreshed from Google Patents.
US987585A
Expired / Lapsed
US
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Extensible ladder.
Assignee: Krupp Stahl AG
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Filing: 1907-10-24
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Granted: 1911-03-21
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Expires: 1927-10-24
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:50
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/397; A; A62; A62B; A62B1/00
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) | 1914-03-20 | 1914-09-19 | 1915-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-03-20 | 1918-09-19 | 1919-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-03-20 | 1922-09-19 | 1923-03-21 | $7700.00 | Window Closed / Lapsed |