US1900422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Entrance control
Assignee: ROLAND H MULFORD
•
Filing: 1928-11-13
•
Granted: 1933-03-07
•
Expires: 1948-11-13
Abstract
No abstract record available.
Inventors
- 👤 Donald J Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:18
CPC Classifications
E; E06; E06B; E06B5/00; E05; E05G; E05G5/00; E05G5/003; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/116; E05Y2900/13; E05Y2900/132
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) | 1936-03-06 | 1936-09-05 | 1937-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-06 | 1940-09-05 | 1941-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-06 | 1944-09-05 | 1945-03-07 | $7700.00 | Window Closed / Lapsed |