US1509780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doorcheck
Assignee: Individual
•
Filing: 1923-09-04
•
Granted: 1924-09-23
•
Expires: 1943-09-04
Abstract
No abstract record available.
Inventors
- 👤 Neill A Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:36
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/02; E05C19/022; Y; Y10; Y10S; Y10S292/00; Y10S292/03; Y10S292/04; Y10S292/15; Y10T; Y10T292/00; Y10T292/08; Y10T292/0911; Y10T292/0945; Y10T292/0948; Y10T292/1043; Y10T292/1075; Y10T292/1078; Y10T292/1083; Y10T292/1085; 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) | 1927-09-23 | 1928-03-24 | 1928-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-09-23 | 1932-03-24 | 1932-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-09-23 | 1936-03-24 | 1936-09-23 | $7700.00 | Window Closed / Lapsed |