US2959245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension and straight knockdown ladder
Assignee: Individual
•
Filing: 1956-05-09
•
Granted: 1960-11-08
•
Expires: 1976-05-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas J O'keefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US467081A
Cited
US1732827A
Cited
US2721060A
Cited
US934736A
Cited
US1213599A
Cited
US1967063A
Cited
US2340387A
Cited
US2594561A
Cited
US2727672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |