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US2772988A
Expired / Lapsed
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Method of waterproofing leather
Assignee: Boehme Fettchemie GmbH
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Filing: 1956-03-16
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Granted: 1956-12-04
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Expires: 1976-03-16
Abstract
No abstract record available.
Inventors
- 👤 Plapper Jurgen
- 👤 Heyden Rudi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:15
CPC Classifications
C; C14; C14C; C14C9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
THE METHOD OF WATER-PROOFING LEATHER WHICH COMPRISES IMPREGNATING TANNED LEATHER WITH A SOLUTION COMPRISING ABOUT 1 TO 15% BY WEIGHT, BASED UPON THE DRY WEIGHT OF THE LEATHER, OF AN ORGANIC METAL COMPLEX COMPOUND PRODUCED BY REACTING A BASIC SALT OF A POLYVALENT METAL WITH AN ACID PHOSPHORIC ACID ESTER OF HIGHERMOLECULAR HYDROXYL COMPOUNDS IN THE PRESENCE OF A LOWER-MOLECULAR MONOHYDROXY ALCOHOL, AND DRYING THE IMPREGNATED LEATHER.
Claim 2
Independent Claim
67 words
THE METHOD OF WATER-PROOFING LEATHER WHICH COMPRISES IMPREGNATING TANNED LEATHER WITH A SOLUTION COMPRISING ABOUT 1 TO 15% BY WEIGHT, BASED UPON THE DRY WEIGHT OF THE LEATHER, OF AN ORGANIC METAL COMPLEX COMPOUND PRODUCED BY REACTING A BASIC SALT OF A POLYVALENT METAL WITH AN ACID PHOSPHORIC ACID ESTER OF HIGHERMOLECULAR HYDROXYL COMPOUNDS IN THE PRESENCE OF A LOWER-MOLECULAR MONOHYDROXY ALCOHOL, AND DRYING THE IMPREGNATED LEATHER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |