Patent US2126333A successfully refreshed from Google Patents.
US2126333A
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US
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Interlock system for doors
Assignee: Railway & Industrial Eng Co
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Filing: 1934-03-17
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Granted: 1938-08-09
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Expires: 1954-03-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:22
CPC Classifications
E; E05; E05C; E05C9/00; E05C9/02; E05C9/026; E05C9/028; Y; Y10; Y10S; Y10S70/00; Y10S70/64; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/60; Y10T70/625; Y10T70/675; Y10T70/70; Y10T70/7441; Y10T70/7446; Y10T70/7458
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) | 1941-08-08 | 1942-02-07 | 1942-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-08 | 1946-02-07 | 1946-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-08 | 1950-02-07 | 1950-08-09 | $7700.00 | Window Closed / Lapsed |