US2979308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling temperature change of blends of fluids or fluids and finely divided solids
Assignee: Graham Engineering Corp
•
Filing: 1957-07-02
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Granted: 1961-04-11
•
Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 David H Putney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:52
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1988766A
Cited
US2085069A
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US2474592A
Cited
US2443817A
Cited
US2762682A
Cited
US2677000A
Cited
US2800307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |