US2231909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring hinge
Assignee: Individual
•
Filing: 1939-06-29
•
Granted: 1941-02-18
•
Expires: 1959-06-29
Abstract
No abstract record available.
Inventors
- 👤 Edwin G Hempel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:50
CPC Classifications
A; A45; A45C; A45C13/00; A45C13/005; E; E05; E05D; E05D11/00; E05D11/10; E05D11/1028; E05D11/105; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/1207; E05Y; E05Y2999/00
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) | 1944-02-18 | 1944-08-19 | 1945-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-18 | 1948-08-19 | 1949-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-18 | 1952-08-19 | 1953-02-18 | $7700.00 | Window Closed / Lapsed |