US2993561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible ladder
Assignee: Individual
•
Filing: 1959-08-13
•
Granted: 1961-07-25
•
Expires: 1979-08-13
Abstract
No abstract record available.
Inventors
- 👤 Cyril J Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:27
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/12; E06C1/125; E06C1/52; E06C7/00; E06C7/42; E06C7/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US530374A
Cited
FR334409A
Cited
US933816A
Cited
US1217279A
Cited
US1712942A
Cited
US1859984A
Cited
US1852976A
Cited
US2127949A
Cited
US2194856A
Cited
US2523535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |