Patent US3386497A successfully refreshed from Google Patents.
US3386497A
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Regenerative heat exchanger for heavy liquids
Assignee: ROBERT H FELDMEIER
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Filing: 1966-09-26
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Granted: 1968-06-04
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Robert H Feldmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:45
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/026; Y; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US856140A
Cited
US872175A
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US912671A
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US1759126A
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US1854619A
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US2259433A
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GB754014A
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US3323585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |