US2744674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sectional ladder
Assignee: Individual
•
Filing: 1954-09-21
•
Granted: 1956-05-08
•
Expires: 1974-09-21
Abstract
No abstract record available.
Inventors
- 👤 John E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:45
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/381; E06C7/00; E06C7/48; F; F16; F16B; F16B2/00; F16B2/02; F16B2/06; F16B2/08; F16B7/00; F16B7/04; F16B7/0406; F16B7/0413; F16B7/042; Y; Y10; Y10T; Y10T403/00; Y10T403/38; Y10T403/55; Y10T403/551
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US144690A
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US282314A
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US316757A
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US375079A
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US439361A
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US459844A
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US826863A
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US1273143A
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US1918293A
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US2194870A
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FR907893A
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US2594561A
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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) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |