Patent US2878531A successfully refreshed from Google Patents.
US2878531A
Expired / Lapsed
US
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Door operating torsional rod assembly
Assignee: SANYMETAL PRODUCTS CO Inc
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Filing: 1957-11-25
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Granted: 1959-03-24
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Expires: 1977-11-25
Abstract
No abstract record available.
Inventors
- 👤 Kent W Benham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:52
CPC Classifications
E; E05; E05D; E05D7/00; E05D7/08; E05D7/081; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/123; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |