US3552030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isothermal drying apparatus and method
Assignee: NAT RES DEV
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Filing: 1968-10-28
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Granted: 1971-01-05
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Expires: 1988-10-28
Abstract
Abstract A METHOD OF DRYING SPECIMENS UNDER ISOTHERMAL CONDITIONS IN WHICH RECEPTABLES CONTAINING THE SPECIMENS ARE UNIFORMLY HEATED TO A PREDETERMINED TEMPERATURE, THE RECEPTACLES ARE PARTIALLY EVACUATED AND THE TOTAL PRESSURE IN THE RECEPTACLES IS VARIED TO MAINTAIN THE LOSS OF HEAT FROM THE SPECIMENS DUE TO EVAPORATIVE COOLING SUBSTANTIALLY EQUAL TO THE RATE AT WHICH HEAT IS SUPPLIED TO THE SPECIMEN. WHEN THE DESICCATION OF THE SPECIMEN IS COMPLETED, THE RECEPTACLES ARE EVACUATED TO A HIGH VACUUM AND HERMETICALY SEALED.
Inventors
- 👤 Alfred Charles Jason
- 👤 Angus Roy Mackenzie
- 👤 Terence George Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:57
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |