Patent US3832203A successfully refreshed from Google Patents.
US3832203A
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Water repellent process and composition water repellent process and composition
Assignee: Dow Silicones UK Ltd
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Filing: 1972-01-21
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Granted: 1974-08-27
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Expires: 1992-01-21
Abstract
Abstract A COMPOSITION FOR TREATING LEATHER TO IMPART DURABLE WATER REPELLENCY THERETO. THE COMPOSITION COMPRISES A SOLVENT SOLUTION OF (1) (A) FROM 15 TO 50 PERCENT BY WEIGHT OF TI(OR)4 OR ZR(OR)4 OR PARTIAL HYDROLYSATE THEREOF IN WHICH R IS AN ALIPHATIC HYDROCARBON OR HYDROXYLATED HYDROCARBON RADICAL, (B) 5 TO 70 PERCENT BY WEIGHT OF A COPOLYMER OF TRIMETHYLSILOXANE AND SIO2 UNITS (C) 15 TO 80 PERCENT OF A POLYSILOXANE OF AVERAGE UNIT FORMULA (R''-)M-SI-O((4-M)/2) IN WHICH R'' ALKYL, ALKENYL AND M IS 2 TO 2.9 AND (2) FROM 0.5 TO 30 PERCENT BY WEIGHT OF AN AMINOALKYL SUBSTITUTED SILANE OR SILOXANE.
Inventors
- 👤 F Saunders
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:50
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |