Patent US2869861A successfully refreshed from Google Patents.
US2869861A
Expired / Lapsed
US
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Automatic door operator
Assignee: Individual
•
Filing: 1957-04-15
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Granted: 1959-01-20
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Expires: 1977-04-15
Abstract
No abstract record available.
Inventors
- 👤 Carlson Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18856; Y10T74/18888; Y10T74/18976; Y10T74/21; Y10T74/2142; Y10T74/2173
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |