Patent US3007680A successfully refreshed from Google Patents.
US3007680A
Expired / Lapsed
US
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Heat exchange device
Assignee: Individual
•
Filing: 1959-07-02
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Granted: 1961-11-07
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Expires: 1979-07-02
Abstract
No abstract record available.
Inventors
- 👤 William E Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:53
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/025; B; B21; B21D; B21D53/00; B21D53/02; B21D53/027; F28D; F28D7/00; F28D7/04; F28D9/00; F28D9/04; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/495; Y10S165/496; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |