US2779561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension ladder jack
Assignee: Individual
•
Filing: 1954-02-18
•
Granted: 1957-01-29
•
Expires: 1974-02-18
Abstract
No abstract record available.
Inventors
- 👤 James H Blundeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:50
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/16; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32426; Y10T403/32442; Y10T403/32451; Y10T403/32459
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US791531A
Cited
US1452182A
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US1576695A
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FR798851A
Cited
US2229475A
Cited
US2488480A
Cited
US2488984A
Cited
US2548380A
Cited
US2577286A
Cited
US2578119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |