US2997363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of complex-metal tanning agents
Assignee: BASF SE
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Filing: 1956-03-26
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Granted: 1961-08-22
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Expires: 1976-03-26
Abstract
No abstract record available.
Inventors
- 👤 Pfirrmann Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:20
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A PROCESS FOR THE PRODUCTION OF TANNING AGENTS WHICH COMPRISES MIXING TOGETHER (I) ONE MOL OF A TANNING SALT OF A COMPLEX-FORMING POLYVALENT METAL, SAID SALT BEING DISPERSIBLE IN WATER WITH AN ACID REACTION AND BEING SELECTED FROM THE GROUP CONSISTING OF ZINC, ALUMINUM, TITANIUM, ZIRCONIUM, CHROMIUM AND IRON WITH (II) ABOUT 1/2 TO 2 MOLS OF AN AMINE CONTAINING AT LEAST ONE HYDROGEN ATOM ON ONE AMINO GROUP, ADDING (III) A MEMBER OF THE CLASS CONSISTING OF FORMALDEHYDE, PARAFORMALDEHYDE, AND POLYGLYOXAL AND CONDENSING THE PRODUCT OF (I), (II) AND (III) IN THE PRESENCE OF (IV) AN AROMATIC HYDROXY COMPOUND WITH (V) A CONDENSATION PRODUCT OF FORMALDEHYDE WITH A MEMBER OF THE CLASS CONSISTING OF UREA, MELAMINE, DICYANDIAMIDE, ETHYLENE-GLYCOLDIURETHANE CONTAINING AT LEAST ONE HYDROGEN ATOM ON ONE AMINO GROUP AND BUTANE-DIOL-DIURETHANE, IN WHICH PROCESS THE AMOUNT BY WEIGHT OF (IV) IS ABOUT 1/3 TO 1 1/2 THAT OF (I)+(II) AND THE AMOUNT OF (V) IS ABOUT THREE TIMES TO TEN TIMES THAT OF (I)+(II), CALCULATED ON THE DRY CONTENT OF THESE SUBSTANCES.
Claim 2
Dependent Claim
172 words
A PROCESS FOR THE PRODUCTION OF TANNING AGENTS WHICH COMPRISES MIXING TOGETHER (I) ONE MOL OF A TANNING SALT OF A COMPLEX-FORMING POLYVALENT METAL, SAID SALT BEING DISPERSIBLE IN WATER WITH AN ACID REACTION AND BEING SELECTED FROM THE GROUP CONSISTING OF ZINC, ALUMINUM, TITANIUM, ZIRCONIUM, CHROMIUM AND IRON WITH (II) ABOUT 1/2 TO 2 MOLS OF AN AMINE CONTAINING AT LEAST ONE HYDROGEN ATOM ON ONE AMINO GROUP, ADDING (III) A MEMBER OF THE CLASS CONSISTING OF FORMALDEHYDE, PARAFORMALDEHYDE, AND POLYGLYOXAL AND CONDENSING THE PRODUCT OF (I), (II) AND (III) IN THE PRESENCE OF (IV) AN AROMATIC HYDROXY COMPOUND WITH (V) A CONDENSATION PRODUCT OF FORMALDEHYDE WITH A MEMBER OF THE CLASS CONSISTING OF UREA, MELAMINE, DICYANDIAMIDE, ETHYLENE-GLYCOLDIURETHANE CONTAINING AT LEAST ONE HYDROGEN ATOM ON ONE AMINO GROUP AND BUTANE-DIOL-DIURETHANE, IN WHICH PROCESS THE AMOUNT BY WEIGHT OF (IV) IS ABOUT 1/3 TO 1 1/2 THAT OF (I)+(II) AND THE AMOUNT OF (V) IS ABOUT THREE TIMES TO TEN TIMES THAT OF (I)+(II), CALCULATED ON THE DRY CONTENT OF THESE SUBSTANCES.
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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |