Patent US2772927A successfully refreshed from Google Patents.
US2772927A
Expired / Lapsed
US
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Ladder attachment
Assignee: Individual
•
Filing: 1954-06-14
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Granted: 1956-12-04
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Expires: 1974-06-14
Abstract
No abstract record available.
Inventors
- 👤 Alva W Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:21
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US606763A
Cited
US931265A
Cited
US897929A
Cited
US1234596A
Cited
CH98246A
Cited
US1760803A
Cited
US1820315A
Cited
US2031615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |