US3058722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: PHIL RICH FAN Mfg CO Inc
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Filing: 1961-01-03
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Granted: 1962-10-16
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Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Hershel M Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:38
CPC Classifications
F; F28; F28B; F28B1/00; F28B1/06; F24; F24F; F24F1/00; F24F1/0007; F24F1/0018; F24F1/0029; F24F1/0059; F28D; F28D7/00; F28D7/02; F28D7/028; F28D7/04; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |