Patent US2490703A successfully refreshed from Google Patents.
US4045174A
Expired / Lapsed
US
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Method of cleaning textiles
Assignee: Boewe Boehler and Weber KG
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Filing: 1975-01-10
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Granted: 1977-08-30
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Expires: 1995-01-10
Abstract
Abstract A load of garments or other textile material to be washed is presoaked in organic solvent, e.g. in a rotating drum, and is then immersed within the same vessel in a water bath while still permeated by a substantial quantity of solvent. During this immersion, the vessel is gradually heated to the boiling point of the solvent, or of the azeotropic water/solvent mixture, which is below the boiling point of water so that only a part of the wash liquor is vaporized. The evaporation can be accelerated by placing the vessel under a partial vacuum. The evaporation rate of the solvent is measured and the washing cycle is halted as soon as that rate drops to zero or below a predetermined limit, with subsequent drying of the load by, for example, centrifugation.
Inventors
- 👤 Heinrich Fuhring
- 👤 Johannes Helmut Sieber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/22; D06B; D06B21/00; D06B21/02; D06F; D06F43/00; D06F43/007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A method of cleaning textiles, comprising the steps of: presoaking a load of textiles to be cleaned within a vessel in an organic dry cleaning solvent vaporizable, at least when in an aqueous azeotropic mixture, at a boiling point lower than that of water; removing excess solvent from the presoaked textiles while leaving some wetted with residual solvent; immersing the solvent-wetted textiles within said vessel in a detergent-enriched water bath with resulting transfer of residual solvent from said textiles to the bath; washing said textiles by agitation in said bath while increasing the bath temperature to a level below the boiling point of water but high enough to vaporize said solvent, thereby progressively depleting said bath of solvent; measuring the rate of vaporization of said solvent; and terminating the immersion upon a dropping of said rate to substantially zero.
Claim 2
Independent Claim
139 words
A method of cleaning textiles, comprising the steps of: presoaking a load of textiles to be cleaned within a vessel in an organic dry cleaning solvent vaporizable, at least when in an aqueous azeotropic mixture, at a boiling point lower than that of water; removing excess solvent from the presoaked textiles while leaving some wetted with residual solvent; immersing the solvent-wetted textiles within said vessel in a detergent-enriched water bath with resulting transfer of residual solvent from said textiles to the bath; washing said textiles by agitation in said bath while increasing the bath temperature to a level below the boiling point of water but high enough to vaporize said solvent, thereby progressively depleting said bath of solvent; measuring the rate of vaporization of said solvent; and terminating the immersion upon a dropping of said rate to substantially zero.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1 wherein said bath is placed under a partial vacuum during vaporization of said solvent.
Claim 4
Dependent Claim
25 words
A method as defined in claim 1 wherein the step of agitating said textiles includes a continuous circulation of the bath liquor through said vessel.
Claim 5
Dependent Claim
31 words
A method as defined in claim 1, comprising the further step of centrifuging said textiles in said vessel upon termination of the immersion by draining the bath liquor from said vessel.
Claim 6
Dependent Claim
12 words
A method as defined in claim 1 wherein said solvent is perchloroethylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |