US2552941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder support
Assignee: Individual
•
Filing: 1946-04-15
•
Granted: 1951-05-15
•
Expires: 1966-04-15
Abstract
No abstract record available.
Inventors
- 👤 Russel C Courtney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US884163A
Cited
US1093419A
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US1543723A
Cited
GB394848A
Cited
FR782952A
Cited
US2312389A
Cited
US2243013A
Cited
US2310930A
Cited
US2330825A
Cited
US2381425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |