US2970033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of tanning leather and product thus produced
Assignee: Wyeth Holdings LLC
•
Filing: 1957-09-06
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Granted: 1961-01-31
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Expires: 1977-09-06
Abstract
No abstract record available.
Inventors
- 👤 Frank A Edmonds
- 👤 Russell P Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:10
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR TANNING LEATHER COMPRISING SOAKING HIDES IN AN AQUEOUS TANNING LIQUOR CONTAINING BETWEEN ABOUT 0.5% AND 10% BY WEIGHT OF DICYANDIAMIDE, BE TWEEN ABOUT 0.5% AND 10% BY WEIGHT OF A WATER-DISPERSIBLE METHYLATED MELAMINE-FORMALDEHYDE RESIN AND BETWEEN ABOUT 0.5% AND 20% BY WEIGHT OF A LIGNOSULFONATE AT A TEMPERATURE BETWEEN ABOUT 60*F. AND 160* F. AND AT A PH BETWEEN ABOUT 3 AND 6 UNTIL SAID HIDES ARE TANNED, SAID PERCENTAGES BEING BASED ON THE WEIGHT OF SAID HIDES.
Claim 2
Dependent Claim
81 words
A PROCESS FOR TANNING LEATHER COMPRISING SOAKING HIDES IN AN AQUEOUS TANNING LIQUOR CONTAINING BETWEEN ABOUT 0.5% AND 10% BY WEIGHT OF DICYANDIAMIDE, BE TWEEN ABOUT 0.5% AND 10% BY WEIGHT OF A WATER-DISPERSIBLE METHYLATED MELAMINE-FORMALDEHYDE RESIN AND BETWEEN ABOUT 0.5% AND 20% BY WEIGHT OF A LIGNOSULFONATE AT A TEMPERATURE BETWEEN ABOUT 60*F. AND 160* F. AND AT A PH BETWEEN ABOUT 3 AND 6 UNTIL SAID HIDES ARE TANNED, SAID PERCENTAGES BEING BASED ON THE WEIGHT OF SAID HIDES.
References Cited (Backward Citations)
US2436363A
Cited
US2729534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |