US3779792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting glass against fogging
Assignee: Czech Academy of Sciences
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Filing: 1971-03-08
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Granted: 1973-12-18
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Expires: 1991-03-08
Abstract
Abstract A method of protecting glass from becoming fogged by water or ice from condensed water vapour of the ambient atmosphere. The glass has applied thereto at least on one surface at least one coating comprising a hydrophilic polymeric salt having one ion covalently bonded and the other free. This coating is conveniently applied upon an intermediate base comprising a hydrophobic polymer which has good adhering properties with the glass surface.
Inventors
- 👤 A Stoy
- 👤 R Urbanova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/12; C; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
A method as claimed in claim 1, wherein the coating comprising the hydrophilic polymeric salt is additionally cross-linked after application on the glass.
Claim 2
Independent Claim
103 words
A method of protecting glass surfaces from becoming fogged by water or ice from condensed water vapor from ambient atmosphere comprising applying onto at least one surface of said glass a hydrophobic polymeric coating base layer and thereafter applying onto said base layer a water insoluble ionic coating comprising a hydrophilic polymeric salt selected from alkaline, ammonium or quaternary ammonium salts of acrylonitrile or methacrylonitrile copolymerized with a member selected from the group consisting of acrylic acid, methacrylic acid and ethylene sulfonic acid, one ion of said hydrophilic polymeric salt being covalently bonded to the polymeric chain, the other ion thereof being free.
Claim 3
Dependent Claim
69 words
A method as defined in claim 3 which comprises applying said hydrophobic polymer for forming said base layer onto said glass surface in the form of an aqueous solution thereof in a dialkyl formamide as solvent, permitting said solution to dry, applying said hydrophilic salt onto said base layer thereby formed in the form of its solution in a different solvent and permitting said hydrophilic salt solution to dry.
Claim 4
Dependent Claim
14 words
A method as defined in claim 3 wherein said hydrophobic polymer is poly(glycidyl methacrylate).
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3, wherein the coating comprising the hydrophilic polymeric salt is additionally cross-linked after application on the glass.
References Cited (Backward Citations)
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US3285802A
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US3625741A
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US3515579A
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US3678098A
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |