Patent US2985437A successfully refreshed from Google Patents.
US2985437A
Expired / Lapsed
US
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Improvement device for conveyor type heat treating furnaces
Assignee: Individual
•
Filing: 1959-05-14
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Granted: 1961-05-23
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Expires: 1979-05-14
Abstract
No abstract record available.
Inventors
- 👤 Irvin M Sargeant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:23
CPC Classifications
F; F27; F27D; F27D99/00; F27D99/0073; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/24; F27B9/243; F27D1/00; F27D1/18; F27D1/1858
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1712132A
Cited
US1792456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |