Patent US5228558A successfully refreshed from Google Patents.
Patent US3269858A successfully refreshed from Google Patents.
US3269858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating leather
Assignee: Rohm and Haas Co
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Filing: 1962-09-05
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Granted: 1966-08-30
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Expires: 1982-09-05
Abstract
No abstract record available.
Inventors
- 👤 Mattei Italo Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:31
CPC Classifications
C; C14; C14C; C14C9/00; Y; Y10; Y10T; Y10T428/00; Y10T428/4935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A PROCESS FOR TREATING LEATHER WHICH COMPRISES APPLYING TO THE LEATHER, FULL TANNED AND FAT-LIQUORED AND IN AIR-DRY CONDITION, ON ONE SIDE ONLY AN AQUEOUS DISPERSION HAVING A PH OF 2 TO 5 AND CONTAINING AT LEAST ABOUT 5% BY WEIGHT BUT NOT OVER 20% BY WEIGHT OF A WATER-INSOLUBLE LINEAR ADDITION POLYMER OF MONOETHYLENICALLY UNSATURATED MOLECULES AND 0.5 TO 8% BY WEIGHT OF A SURFACE-ACTIVE AGENT, THE POLYMER HAVING A T1 VALUE NOT OVER 30*C. AND THE DISPERSED PARTICLES OF THE POLYMER HAVING A SURFACE AVERAGE RADIUS BETWEEN 250 AND 1300 ANGSTROMS, THE AMOUNT OF PIGMENT, IF ANY, AND BEING IN EXCESS OF 3 PARTS PER 100 PARTS BY WEIGHT OF THE DISPERSION THE IMPREGNATION BEING EFFECTED TO DISTRIBUTE AT LEAST 90% OF THE POLYMER THROUGH AT LEAST 15% BUT NOT OVER 40% OF THE THICKNESS OF THE LEATHER.
Claim 2
Dependent Claim
140 words
A PROCESS FOR TREATING LEATHER WHICH COMPRISES APPLYING TO THE LEATHER, FULL TANNED AND FAT-LIQUORED AND IN AIR-DRY CONDITION, ON ONE SIDE ONLY AN AQUEOUS DISPERSION HAVING A PH OF 2 TO 5 AND CONTAINING AT LEAST ABOUT 5% BY WEIGHT BUT NOT OVER 20% BY WEIGHT OF A WATER-INSOLUBLE LINEAR ADDITION POLYMER OF MONOETHYLENICALLY UNSATURATED MOLECULES AND 0.5 TO 8% BY WEIGHT OF A SURFACE-ACTIVE AGENT, THE POLYMER HAVING A T1 VALUE NOT OVER 30*C. AND THE DISPERSED PARTICLES OF THE POLYMER HAVING A SURFACE AVERAGE RADIUS BETWEEN 250 AND 1300 ANGSTROMS, THE AMOUNT OF PIGMENT, IF ANY, AND BEING IN EXCESS OF 3 PARTS PER 100 PARTS BY WEIGHT OF THE DISPERSION THE IMPREGNATION BEING EFFECTED TO DISTRIBUTE AT LEAST 90% OF THE POLYMER THROUGH AT LEAST 15% BUT NOT OVER 40% OF THE THICKNESS OF THE LEATHER.
References Cited (Backward Citations)
US3103447A
Cited
US2126321A
Cited
US2204520A
Cited
US2744836A
Cited
US2828220A
Cited
US2828222A
Cited
US2865877A
Cited
US2923646A
Cited
US3048496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |