Patent US3242977A successfully refreshed from Google Patents.
US3242977A
Expired / Lapsed
US
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Rotary heat exchanger drum construction
Assignee: International Motors LLC
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Filing: 1965-04-30
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Granted: 1966-03-29
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Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 David A Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:04
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/045
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |