US2727672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated metal ladder
Assignee: Individual
•
Filing: 1953-04-03
•
Granted: 1955-12-20
•
Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 Luca Arthur S De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:42
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/082; E06C7/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US175544A
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US444035A
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US997281A
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US1136010A
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US1248445A
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US1243436A
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US1718385A
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US1852146A
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US2064803A
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US2040977A
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US2143783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |