US3579540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for protecting nonporous substrates and for rendering them water repellent
Assignee: Individual
•
Filing: 1968-11-01
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Granted: 1971-05-18
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Expires: 1988-11-01
Abstract
Abstract METHOD AND COMPOSITION FOR TREATING NONPOROUS SUBSTRATES TO PROTECT AND RENDER SAME WATER REPELLENT. A MINERAL ACID IS ADDED TO A SOLVENT AND AN ALKYL POLYSILOXANE IS THEN ADDED TO THAT MIXTURE TO PRODUCE THE COMPOSITION. THE ALKYL POLYSILOXANE HAS THE FORMULA: -(SI(-R1)(-R2)-O)N- WHEREIN N IS AN INTEGER GREATER THAN 1, R1 IS A LOWER ALKYL CONTAINING 1-7 CARBON ATOMS AND R2 IS HYDROGEN, A LOWER ALKYL CONTAINING 1-7 CARBON ATOMS OR AN ARYL RADICAL CONTAINING ABOUT 6 CARBON ATOMS.
Inventors
- 👤 Howard G Ohlhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; C03; C03C; C03C17/00; C03C17/28; C03C17/30; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/49; C04B41/4905; C04B41/495; C04B41/4961; C08K3/00; C08K3/01; C09; C09D; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663
Claims Analysis
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |