US2602825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sublimation process and apparatus
Assignee: FJ Stokes Machine Co
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Filing: 1948-01-24
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Granted: 1952-07-08
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Expires: 1968-01-24
Abstract
No abstract record available.
Inventors
- 👤 Earl W Flosdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:26
CPC Classifications
B; B01; B01D; B01D7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
THE PROCESS OF PURIFYING BY SUBLIMATION A SUBLIMABLE COMMINUTED SUBSTANCE WHICH INCLUDES PLACING THE IMPURE COMMINUTED SUBSTANCE IN PANS PROVIDED WITH TOPS, NOT MORE THAN 12 INCHES FROM THE SUBSTANCE WITHIN THE PAN, PLACING AT LEAST ONE SUCH TRAY IN A CHAMBER, REDUCING THE PRESSURE IN THE CHAMBER TO BELOW 8 MM., HEATING THE BOTTOMS OF THE PANS SUFFICIENTLY TO HEAT THE SUBSTANCE TO A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE IT TO SUBLIME AT SAID PRESSURE, COOLING THE TOPS OF THE TRAYS BELOW THE TEMPERATURE AT WHICH THE VAPOR PRESSURE OF THE SUBLIMABLE SUBSTANCE IS EQUAL TO SAID PRESSURE, WHEREBY THE MATERIAL SUBLIMES FROM EACH SAID LAYER IN EACH PAN CONDENSES IN SOLID FORM ON EACH OF SAID PAN TOPS, AND THE PATH OF TRAVEL OF THE VAPOR DOES NOT EXCEED 12 INCHES.
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Cited
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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) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |