Patent US2288914A successfully refreshed from Google Patents.
Patent US3779440A successfully refreshed from Google Patents.
US39663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in chairs for invalids
Assignee: —
•
Filing: —
•
Granted: 1863-08-25
•
Expires: 1880-08-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:55
CPC Classifications
A; A47; A47C; A47C4/00; A47C4/02; Y; Y10; Y10S; Y10S436/00; Y10S436/80
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1866-08-24 | 1867-02-23 | 1867-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1870-08-24 | 1871-02-23 | 1871-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1874-08-24 | 1875-02-23 | 1875-08-25 | $7700.00 | Window Closed / Lapsed |