Patent US3481768A successfully refreshed from Google Patents.
US3481768A
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Method for rendering solid or porous materials hydrophobic
Assignee: Dow Silicones Corp
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Filing: 1967-05-15
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Granted: 1969-12-02
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Expires: 1987-05-15
Abstract
No abstract record available.
Inventors
- 👤 William G Gowdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:17
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/66; Y; Y10; Y10S; Y10S428/00; Y10S428/907; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31844; Y10T428/31855
Claims Analysis
Total Claims: 0
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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) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |