US3663293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor generating apparatus for vapor degreasing process
Assignee: Dow Chemical Co
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Filing: 1970-07-16
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Granted: 1972-05-16
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Expires: 1990-07-16
Abstract
Abstract A method and apparatus for continuously producing solvent vapors for degreasing metal parts and simultaneously purifying the solvent by directing liquid solvent which contains high boiling impurities onto a gravity flow heat exchange surface thereby to vaporize the low boiling solvent away from the high boiling impurities as the solvent flows across the heat exchange surface.
Inventors
- 👤 Kenneth S Surprenant
- 👤 Raymond T Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:03
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
22 words
A process as in claim 1, wherein said heat exchange surface is a roughened surface provided with small pockets disposed transversely thereof.
References Cited (Backward Citations)
US1905968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |