Patent US2184607A successfully refreshed from Google Patents.
US2184607A
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Hydraulic door check
Assignee: Individual
•
Filing: 1936-01-15
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Granted: 1939-12-26
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Expires: 1956-01-15
Abstract
No abstract record available.
Inventors
- 👤 Swanson Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:43
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/14; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/21; E05Y2201/23; E05Y2201/232; E05Y2201/252; E05Y2201/254; E05Y2201/256; E05Y2201/262; E05Y2201/266; E05Y2201/40; E05Y2201/43; E05Y2201/448; E05Y2201/458; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/1963
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) | 1942-12-25 | 1943-06-26 | 1943-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-25 | 1947-06-26 | 1947-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-25 | 1951-06-26 | 1951-12-26 | $7700.00 | Window Closed / Lapsed |