US2630887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lock for adjustable chair backs
Assignee: Weatherhead Co
•
Filing: 1946-09-11
•
Granted: 1953-03-10
•
Expires: 1966-09-11
Abstract
No abstract record available.
Inventors
- 👤 Paquin Joseph Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:50
CPC Classifications
B; B61; B61D; B61D33/00; B61D33/0092; B60; B60N; B60N2/00; B60N2/02; B60N2/22; B60N2/23; B60N2/231
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US703227A
Cited
US740966A
Cited
GB268840A
Cited
US1821429A
Cited
US1776402A
Cited
AU166731A
Cited
US2205508A
Cited
US2194120A
Cited
US2218963A
Cited
US2522246A
Cited
US2559047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |