US2803552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifog materials and method of producing the same
Assignee: National Research Council Canada
•
Filing: 1953-07-01
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Granted: 1957-08-20
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Expires: 1973-07-01
Abstract
No abstract record available.
Inventors
- 👤 Donald F Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:31
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
AN ANTIFOG MATERIAL CONSISTING ESSENTIALLY OF A MONOHYDRIC POLYETHOXY ALCOHOL CONTAINING BETWEEN 12 AND 30 CARBON ATOMS AND AT LEAST 3 AND NOT MORE THAN 7 ETHYLENE OXIDE GROUPS SYNTHESIZED IN THE PRESENCE OF A SODIUM CATALYST RETAINED THEREIN, AND STABILIZED BY SUBSTANTIALLY REMOVING ALKALINITY BY OXIDATION WITH OXYGEN.
Claim 2
Dependent Claim
49 words
AN ANTIFOG MATERIAL CONSISTING ESSENTIALLY OF A MONOHYDRIC POLYETHOXY ALCOHOL CONTAINING BETWEEN 12 AND 30 CARBON ATOMS AND AT LEAST 3 AND NOT MORE THAN 7 ETHYLENE OXIDE GROUPS SYNTHESIZED IN THE PRESENCE OF A SODIUM CATALYST RETAINED THEREIN, AND STABILIZED BY SUBSTANTIALLY REMOVING ALKALINITY BY OXIDATION WITH OXYGEN.
References Cited (Backward Citations)
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Cited
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Cited
US2372171A
Cited
US2393863A
Cited
US2454886A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |