Patent US3809535A successfully refreshed from Google Patents.
US3809535A
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Dry cleaning of textiles
Assignee: Rhone Progil SA
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Filing: 1971-12-15
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Granted: 1974-05-07
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Expires: 1991-12-15
Abstract
Abstract A METHOD OF WASHING SOLID, MORE PARTICULARLY TEXTILE ARTICLES WITH AN ORGANIC SOLVENT, IMPROVED BY ADDING AN INTENSIFIER. THE INTENSIFIER IS A PRIMARY OR SECONDARY AMIDE OF A DICARBOXYLIC ALIPHATIC ACID OR ANHYDRIDE WHEREIN ONE CARBON ATOM IN THE CHAIN CONNECTING THE TWO ACID GROUPS BEARS AN ALKYL OR ALKENYL RADICAL CONTAINING AT LEAST SIX CARBON ATOMS. THE METHOD GIVES BETTER WHITENESS AND MORE PARTICULARLY PREVENTS THE RE-DEPOSITION OF DIRT.
Inventors
- 👤 Jean Neel
- 👤 Bernard Papillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:21
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5004; C11D7/5013; C11D3/00; C11D3/16; C11D3/26; C11D3/32; D; D06; D06L; D06L1/00; D06L1/02; D06L1/04; C11D7/22; C11D7/24; C11D7/28; C11D7/32; C11D7/3209; C11D7/3263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |