US2800371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratchet ladder
Assignee: Individual
•
Filing: 1954-06-22
•
Granted: 1957-07-23
•
Expires: 1974-06-22
Abstract
No abstract record available.
Inventors
- 👤 Louis C Quercetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:02
CPC Classifications
A; A63; A63B; A63B27/00; E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C7/00; E06C7/12; E06C7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |