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Patent US2503626A successfully refreshed from Google Patents.
US2503626A
Expired / Lapsed
US
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Ladder extension
Assignee: Individual
•
Filing: 1947-03-31
•
Granted: 1950-04-11
•
Expires: 1967-03-31
Abstract
No abstract record available.
Inventors
- 👤 Robert C Mayberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:43
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US742288A
Cited
US1293066A
Cited
US1460359A
Cited
US1651863A
Cited
US1897840A
Cited
US2451113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |