US2636659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension ladder
Assignee: HELEN SALISBURY NIXON
•
Filing: 1949-04-15
•
Granted: 1953-04-28
•
Expires: 1969-04-15
Abstract
No abstract record available.
Inventors
- 👤 Raymond R Salisbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:59
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/14; E06C1/16; E06C1/20; E06C1/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US428995A
Cited
US952277A
Cited
US1582794A
Cited
US1588295A
Cited
US1595450A
Cited
CH132565A
Cited
US1887546A
Cited
US1949972A
Cited
US2021494A
Cited
US2143783A
Cited
GB593874A
Cited
US2466838A
Cited
US2610875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |