Patent US2957538A successfully refreshed from Google Patents.
US2957538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder bolt or the like
Assignee: Blaw Knox Co
•
Filing: 1957-11-18
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Granted: 1960-10-25
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Expires: 1977-11-18
Abstract
No abstract record available.
Inventors
- 👤 Edward W Pottmeyer
- 👤 William C Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:35
CPC Classifications
E; E06; E06C; E06C9/00; E06C9/02; E06C9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL37011C
Cited
US614177A
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US1292984A
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US1531949A
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US1799602A
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US2312985A
Cited
US2640670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |