US2511077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder
Assignee: Individual
•
Filing: 1948-10-23
•
Granted: 1950-06-13
•
Expires: 1968-10-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Austin T Race
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/082; E06C7/085; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/4992; Y10T403/00; Y10T403/33; Y10T403/49; Y10T403/4924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US425948A
Cited
US449721A
Cited
US1157666A
Cited
US1814703A
Cited
US1912331A
Cited
US2040977A
Cited
US2171863A
Cited
GB593874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |