US3527290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Durion Co Inc
•
Filing: 1968-08-26
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Granted: 1970-09-08
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Expires: 1988-08-26
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Lossing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:06
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0219; F28D; F28D7/00; F28D7/16; F28D7/163; F28D7/1638; F28F9/26; F28F2280/00; F28F2280/02
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) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |