Patent US2794583A successfully refreshed from Google Patents.
US2794583A
Expired / Lapsed
US
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Press ladder construction
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1952-08-02
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Granted: 1957-06-04
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Expires: 1972-08-02
Abstract
No abstract record available.
Inventors
- 👤 Ernst Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:38
CPC Classifications
E; E06; E06C; E06C9/00; E06C9/06; E06C9/08; B; B30; B30B; B30B15/00; B30B15/0052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US226935A
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GB189814056A
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US662545A
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DE561594C
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US2068028A
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US2576584A
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US2622783A
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DK11982A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |