US1220084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-acting spring-hinge for doors.
Assignee: Individual
•
Filing: 1915-06-28
•
Granted: 1917-03-20
•
Expires: 1935-06-28
Abstract
No abstract record available.
Inventors
- 👤 Hermann Francksen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:47
CPC Classifications
E; E05; E05D; E05D3/00; E05D3/06; E05D3/12; E05D3/125; E05D3/127; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/53; E05Y2900/531
Claims Analysis
Total Claims: 0
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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) | 1920-03-19 | 1920-09-18 | 1921-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-03-19 | 1924-09-18 | 1925-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-03-19 | 1928-09-18 | 1929-03-20 | $7700.00 | Window Closed / Lapsed |