US3807948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry cleaning
Assignee: Neil and Spencer Ltd
•
Filing: 1972-03-13
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Granted: 1974-04-30
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Expires: 1992-03-13
Abstract
Abstract A method of dry cleaning of goods in which the majority of the solvent present in the goods at the conclusion of the actual cleaning is recovered by circulating air, by means of a fan, through the goods in a dry cleaning drum and through a watercooled condenser and a heating element, and then a small remaining amount of solvent is removed from the goods by a deodorizing operation, in which air is passed in a closed circuit through the goods in the dry cleaning drum and over a refrigerated surface on which the solvent is condensed.
Inventors
- 👤 W Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:00
CPC Classifications
D; D06; D06F; D06F43/00; D06F43/08; D06F43/086
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
39 words
A method according to claim 1, in which during deodorizing the air is passed through the same fan and condenser as during recovery and thence is returned to the drum through a chamber in which is the refrigerated surface.
Claim 2
Dependent Claim
33 words
A method according to claim 2, in which the refrigerated surface is the exterior of a body of substantial thermal capacity, and the body is refrigerated during recovery as well as during deodorizing.
Claim 3
Dependent Claim
44 words
A method according to claim 1, in which during deodorizing the air is passed through the same fan, condenser and heater as during recovery, and the refrigerated surface lies in the circuit between the condenser and the heater and is refrigerated only during deodorizing.
Claim 4
Dependent Claim
20 words
A method according to claim 1, in which the solvent used is a composition containing 1,1,1 trichloroethane and a stabiliser.
Claim 5
Dependent Claim
19 words
A method according to claim 1, in which the temperature of the refrigerated surface during deodorizing is about -20*C.
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |