Patent US2875187A successfully refreshed from Google Patents.
US2660412A
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Heat exchange panel and its method of manufacture
Assignee: Houdaille Hershey Corp
•
Filing: 1949-03-17
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Granted: 1953-11-24
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Expires: 1969-03-17
Abstract
No abstract record available.
Inventors
- 👤 Ray A Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:24
CPC Classifications
F; F25; F25B; F25B39/00; F25B39/02; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22; F28F2225/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
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) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |