US2900041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sectional ladders
Assignee: Individual
•
Filing: 1957-06-28
•
Granted: 1959-08-18
•
Expires: 1977-06-28
Abstract
No abstract record available.
Inventors
- 👤 Cyril E Leavitt
- 👤 Charles E Whitehurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:38
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/10; Y; Y10; Y10T; Y10T403/00; Y10T403/33; Y10T403/335; Y10T403/59; Y10T403/598; Y10T403/599
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US112697A
Cited
US376794A
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US472406A
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US724953A
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US736495A
Cited
US1104236A
Cited
US1422654A
Cited
US1503880A
Cited
DE690550C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |