Patent US2758835A successfully refreshed from Google Patents.
US2758835A
Expired / Lapsed
US
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Automatic door operator
Assignee: TREADWAY CORP
•
Filing: 1952-07-31
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Granted: 1956-08-14
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Expires: 1972-07-31
Abstract
No abstract record available.
Inventors
- 👤 Lance A Wikkerink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:01
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20558
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |