Patent US3411571A successfully refreshed from Google Patents.
US3411571A
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Heat storage exchange apparatus and method therefor
Assignee: Hooker Chemical Corp
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Filing: 1966-11-07
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Granted: 1968-11-19
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Expires: 1986-11-07
Abstract
No abstract record available.
Inventors
- 👤 Lawrence Willis Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:45
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0034; F01; F01K; F01K3/00; F24; F24D; F24D11/00; F24D11/002; F24H; F24H7/00; F24H7/02; F24H7/04; F24H7/0408; F24H7/0433; G; G05; G05D; G05D23/00; G05D23/01; G05D23/13; G05D23/1393; Y; Y02; Y02E; Y02E60/00; Y02E60/14; Y02E70/00; Y02E70/30; Y10; Y10S; Y10S159/00; Y10S159/18
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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |