Patent US2542256A successfully refreshed from Google Patents.
US2542256A
Expired / Lapsed
US
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Shiftable ladder support
Assignee: Individual
•
Filing: 1948-03-22
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Granted: 1951-02-20
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Expires: 1968-03-22
Abstract
No abstract record available.
Inventors
- 👤 Mehringer Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:10
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/397
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US972001A
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US1004284A
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US1447092A
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US1503581A
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US1576695A
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US1997462A
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US1926697A
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US2046516A
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US2272642A
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US2499091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |