Patent US2156874A successfully refreshed from Google Patents.
US2156874A
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Door holding and door control mechanism
Assignee: Individual
•
Filing: 1938-09-14
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Granted: 1939-05-02
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Expires: 1958-09-14
Abstract
No abstract record available.
Inventors
- 👤 Rudolph I Schonitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:10
CPC Classifications
E; E05; E05B; E05B85/00; E05B85/20; E05B85/24; E05B85/243; E05B85/04; E05B85/045; Y; Y10; Y10S; Y10S292/00; Y10S292/23; Y10S292/39; Y10S292/40; Y10S292/72; Y10T; Y10T292/00; Y10T292/08; Y10T292/1039; Y10T292/10395; Y10T292/104; Y10T292/1043; Y10T292/1044; Y10T292/1045; Y10T292/1047; Y10T292/42; Y10T292/432; Y10T292/444; Y10T292/68; Y10T292/688; Y10T292/691
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) | 1942-05-01 | 1942-10-31 | 1943-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-01 | 1946-10-31 | 1947-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-01 | 1950-10-31 | 1951-05-02 | $7700.00 | Window Closed / Lapsed |