US3792976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum-chrome acrylic acid complex tannage and leather aluminum or
Assignee: BASF SE
•
Filing: 1971-11-04
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Granted: 1974-02-19
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Expires: 1991-11-04
Abstract
Abstract Complex trinuclear metal salts, methods for the production of these salts by reaction of salts of aluminum or of aluminum and trivalent chromium, which contain monovalent anions, with acrylic acid and the amount of an alkaline reacting agent necessary for their neutralization or with salts of acrylic acid and a method of tanning using these metal salts.
Inventors
- 👤 H Erdmann
- 👤 F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:17
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/04; C07; C07F; C07F5/00; C07F5/06; C07F5/069
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
A tanning process as claimed in claim 1 wherein, following the treatment, the acrylato radicals contained in the complex salt are homopolymerized.
Claim 2
Dependent Claim
110 words
Leather which has been obtained from a pelt which has been tanned with a complex trinuclear metal salt whose cations have the formula: (Ma1 M(3 a)2 Rm (OH)(6 m) (H2O)6) ( )( )( ) where M1 denotes aluminum and M2 denotes trivalent chromium as central atoms, R denotes the radical of acrylic acid twice combined between two metal atoms, a denotes an integer from 1 to 3 and m denotes an integer from 2 to 6 and which contains monovalent anions which do not make the complex metal salt insoluble in water and are selected from the group consisting of chloride, bromide, iodide, perchlorate, nitrate, formate, acetate and propionate ions.
Claim 3
Dependent Claim
16 words
Leather as claimed in claim 3 wherein a denotes one of the integers 1 or 2.
Claim 4
Dependent Claim
13 words
Leather as claimed in claim 4 wherein said monovalent anions are chloride ions.
Claim 5
Dependent Claim
13 words
Leather as claimed in claim 3 wherein said monovalent anions are chloride ions.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |