US2639853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder structure
Assignee: Individual
•
Filing: 1947-12-05
•
Granted: 1953-05-26
•
Expires: 1967-12-05
Abstract
No abstract record available.
Inventors
- 👤 Robert E Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:51
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/32; E06C1/38; E06C1/39; E06C1/393; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US813981A
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US851696A
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US1050273A
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US1441529A
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US1600572A
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US1942849A
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US2007713A
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US1996133A
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FR807836A
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US2388415A
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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) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |