US2936849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder levelers
Assignee: White Metal Rolling and Stamping Corp
•
Filing: 1957-08-13
•
Granted: 1960-05-17
•
Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Clayton E Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:22
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US409711A
Cited
US1179391A
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US1251192A
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US1393536A
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US1499300A
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US1631513A
Cited
US1687388A
Cited
US2458076A
Cited
US2552630A
Cited
US2599117A
Cited
FR1010915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |