US2874960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic door check
Assignee: National Pneumatic Co Inc
•
Filing: 1954-08-26
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Granted: 1959-02-24
•
Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Durbin Vernon
- 👤 Ernest W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:29
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/611; E05F15/614; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/23; E05Y2201/232; E05Y2201/234; E05Y2201/60; E05Y2201/622; E05Y2201/644; E05Y2201/656; E05Y2400/00; E05Y2400/10; E05Y2400/30; E05Y2400/3013; 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) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |