Patent US3447598A successfully refreshed from Google Patents.
US3447598A
Expired / Lapsed
US
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Air cooled heat exchanger
Assignee: Pullman Inc
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Filing: 1967-05-12
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Granted: 1969-06-03
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Expires: 1987-05-12
Abstract
No abstract record available.
Inventors
- 👤 David Kaess Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:28
CPC Classifications
F; F28; F28B; F28B1/00; F28B1/06; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28F; F28F9/00; F28F9/007; F28F9/013
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) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |