US1724438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doorcheck
Assignee: Individual
•
Filing: 1927-06-10
•
Granted: 1929-08-13
•
Expires: 1947-06-10
Abstract
No abstract record available.
Inventors
- 👤 John C Vance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:29
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/02; E05C19/022; Y; Y10; Y10S; Y10S292/00; Y10S292/04; Y10T; Y10T292/00; Y10T292/08; Y10T292/0876; Y10T292/0883; Y10T292/0911; Y10T292/0945; Y10T292/0948; Y10T292/1043; Y10T292/1075; Y10T292/1078; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/20666
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) | 1932-08-12 | 1933-02-11 | 1933-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-08-12 | 1937-02-11 | 1937-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-08-12 | 1941-02-11 | 1941-08-13 | $7700.00 | Window Closed / Lapsed |