US2661191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Houdaille Hershey Corp
•
Filing: 1950-02-08
•
Granted: 1953-12-01
•
Expires: 1970-02-08
Abstract
No abstract record available.
Inventors
- 👤 Ray A Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:10
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1707655A
Cited
US2063646A
Cited
GB403899A
Cited
US2091584A
Cited
GB470978A
Cited
US2289685A
Cited
US2306385A
Cited
US2281299A
Cited
US2430774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |