US2458076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder extension
Assignee: Individual
•
Filing: 1947-03-12
•
Granted: 1949-01-04
•
Expires: 1967-03-12
Abstract
No abstract record available.
Inventors
- 👤 Charles O Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:38
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32426; Y10T403/32442; Y10T403/32451; Y10T403/71; Y10T403/7152
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US722409A
Cited
US898973A
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US970425A
Cited
US1179391A
Cited
US1733338A
Cited
US1780263A
Cited
US1897840A
Cited
US2152895A
Cited
US2217996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |