Patent US3617208A successfully refreshed from Google Patents.
US3617208A
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Methods and apparatus for cleaning textiles
Assignee: Individual
•
Filing: 1969-11-18
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Granted: 1971-11-02
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Expires: 1989-11-18
Abstract
Abstract Low-boiling solvent is circulated in a dry cleaning apparatus during cleaning from a cleaning tank through a filter to a storage tank and back to the cleaning tank. Mechanical refrigeration units control the temperature and pressure in the apparatus by drawing solvent vapors from the tanks and returning cold liquid solvent to the storage tank. One of the units also condenses the solvent vapors driven out of the cleaned objects by heating after the cleaning step, and makes a vent unnecessary.
Inventors
- 👤 Manfred Rolf Burger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:37
CPC Classifications
D; D06; D06F; D06F43/00; D06F43/007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
In a method as set forth in claim 1, said solvent having a boiling point between 20* and 50* C.
Claim 2
Dependent Claim
15 words
In a method as set forth in claim 1, said solvent being a halogenated hydrocarbon.
Claim 3
Dependent Claim
60 words
In a method as set forth in claim 1, said contents of the tank being heated to the boiling point of said solvent, and said cooling being sufficient to make the temperature of said liquid substantially lower than said boiling point, said liquid and said vapor being kept in contact with each other prior to said removing of the liquid.
Claim 4
Dependent Claim
39 words
A method according to claim 1, including removing air present in the cleaning tank with the solvent vapor separating the air from the resultant liquid solvent, and heating the separated air and returning it to the cleaning tank chamber.
Claim 5
Dependent Claim
12 words
A method according to claim 1 in which the solvent is monofluorotrichloromethane.
Claim 6
Dependent Claim
87 words
In a drycleaning method in which textiles to be cleaned are agitated in a cleaning tank partly filled with a drycleaning solvent having a boiling pOint between 9* and 120* C., the remainder of said tank containing vapor of said solvent, the improvement which comprises: a. withdrawing a portion of said vapor from said cleaning tank; b. compressing the withdrawn portion of said vapor until the temperature thereof increases; c. cooling the compressed vapor while maintaining the pressure thereof; d. reducing said pressure to a lower value,
References Cited (Backward Citations)
US3122908A
Cited
US3426446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |