Patent US2543789A successfully refreshed from Google Patents.
US2543789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic door operator
Assignee: Individual
•
Filing: 1946-07-16
•
Granted: 1951-03-06
•
Expires: 1966-07-16
Abstract
No abstract record available.
Inventors
- 👤 Duncan C Macmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:46
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/70; E05F15/77
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US951750A
Cited
US1783633A
Cited
US1760479A
Cited
US2001416A
Cited
US2118930A
Cited
US2203871A
Cited
GB577730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |