Patent US5197598A successfully refreshed from Google Patents.
Patent US3519069A successfully refreshed from Google Patents.
US3519069A
Expired / Lapsed
US
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Heat exchanging apparatus
Assignee: Individual
•
Filing: 1968-06-03
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Granted: 1970-07-07
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Expires: 1988-06-03
Abstract
No abstract record available.
Inventors
- 👤 Lee Robert Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:35
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/02; F24F1/028; F24F1/0284; F24F1/03; F24F1/031; F24F1/032; F24F1/0323; F24F1/037
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US121942A
Cited
US2899984A
Cited
US2899802A
Cited
US2401560A
Cited
US2941381A
Cited
US3084522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |