Patent US2520616A successfully refreshed from Google Patents.
US2520616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring hinge
Assignee: NIK O LOK CO
•
Filing: 1947-03-24
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Granted: 1950-08-29
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Expires: 1967-03-24
Abstract
No abstract record available.
Inventors
- 👤 Wasson Clifford Harrison
- 👤 Neer Louis Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:49
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/1207; E05F1/1215; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |