Patent US3721044A successfully refreshed from Google Patents.
US3721044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hinge means for reversible windows
Assignee: SPILKA AS
•
Filing: 1971-06-03
•
Granted: 1973-03-20
•
Expires: 1991-06-03
Abstract
Abstract A HINGE MEANS FOR WINDOWS PERMITTING POSITIONING OF THE SASH IN VARIOUS POSITIONS AND ALSO REVERSAL OF THE SASH. D R A W I N G
Inventors
- 👤 H Kvasnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:48
CPC Classifications
E; E05; E05D; E05D15/00; E05D15/40; E05D15/44; E05Y; E05Y2800/00; E05Y2800/74; E05Y2800/742; E05Y2800/744; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/148
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |