Patent US3447198A successfully refreshed from Google Patents.
US3447198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair control back back-plate with integrally formed bearings
Assignee: Doerner Products Co Ltd
•
Filing: 1966-09-28
•
Granted: 1969-06-03
•
Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 Frank Doerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:31
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/48; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49876
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2239732A
Cited
US2186557A
Cited
US2379928A
Cited
US2677129A
Cited
FR1230180A
Cited
US3038676A
Cited
US3156756A
Cited
US3226763A
Cited
US3242564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |