US2923633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rain repellents for windshields
Assignee: National Research Council Canada
•
Filing: 1957-06-21
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Granted: 1960-02-02
•
Expires: 1977-06-21
Abstract
No abstract record available.
Inventors
- 👤 Donald F Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
AS A RAIN REPELLENT FOR TRANSPARENT WINDOWS, A POLYSILICANE CONSISTING OF A PLURALITY OF SI-SI LINKAGES HAVING A PLURALITY OF DIRECTLY ATTACHED ALKYL GROUPS EACH HAVING MORE THAN 1 AND NOT MORE THAN 7 CARBON ATOMS, AND A METHOXY GROUP, IN ADMIXTURE WITH A FRICTION AGENT SELECTED FROM THE GROUP CONSISTING OF CARBON BLACK AND ROUGE.
References Cited (Backward Citations)
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US2507502A
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US2612511A
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US2507520A
Cited
US2706724A
Cited
US2881197A
Cited
US2777772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |