US3784400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing dry-cleanable soil-resistant leathers
Assignee: Pennwalt Corp
•
Filing: 1972-03-22
•
Granted: 1974-01-08
•
Expires: 1992-03-22
Abstract
Abstract A fatliquor composition useful for leather treatment comprises a mixture of alkenyl substituted succinic acid or succinic acid anhydride, sulfated fatty oil, and an amine or amide. The leather is treated with an aqueous emulsion of the fatliquor composition and then with an aqueous solution of the chromium coordination complex of perfluoroalkyl-containing carboxylic acid to provide a soil and water-repellent leather that is resistant to loss of lubricity when drycleaned.
Inventors
- 👤 V Cassella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:12
CPC Classifications
C; C14; C14C; C14C9/00; C14C9/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The method in accordance with claim 1 wherein the alkenyl group of the substituted succinic acid or anhydride has from 15 to 20 carbon atoms.
Claim 2
Dependent Claim
14 words
The method in accordance with claim 1 wherein the organic, nitrogen-containing compound is morpholine.
Claim 3
Dependent Claim
33 words
The method in accordance with claim 1 wherein there are from 10 to 40 parts by weight of sulfated fatty oil and about 10 to 15 parts by weight of the nitrogen-containing compound.
Claim 4
Dependent Claim
21 words
The method according to claim 1 wherein the perfluoroalkyl group of the carboxylic acid has from 9 to 15 carbon atoms.
Claim 5
Dependent Claim
22 words
The method according to claim 1 wherein the pH of the aqueous solution of perfluoroalkyl carboxylic acid is from 3 to 3.5.
References Cited (Backward Citations)
US2374678A
Cited
US2693996A
Cited
US2892673A
Cited
US2934450A
Cited
US2974000A
Cited
US3484271A
Cited
US3351643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |