Patent US2637581A successfully refreshed from Google Patents.
US2637581A
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Assignee: ROETHEL ENGINEERING Corp
•
Filing: 1945-01-11
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Granted: 1953-05-05
•
Expires: 1965-01-11
Abstract
No abstract record available.
Inventors
- 👤 John H Roethel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:26
CPC Classifications
E; E05; E05B; E05B85/00; E05B85/20; E05B85/24; Y; Y10; Y10S; Y10S70/00; Y10S70/54; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1062
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) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |