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US3655432A
Expired / Lapsed
US
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Abrasion resistant coating of polyether polyurethane
Assignee: Amicon Corp
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Filing: 1969-05-02
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Granted: 1972-04-11
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Expires: 1989-05-02
Abstract
Abstract Abrasion resistant coatings for use on plastic articles which coatings are the cured reaction products formed of (1) a polyfunctional biuret formed of an aliphatic diisocyanate and water and (2) a polyethylene glycol. Plastic articles include acrylic, cellulose propionate and polycarbonate substrates. Preferred embodiments of the invention are those containing little or no solvent.
Inventors
- 👤 Robert W Hausslein
- 👤 Henry E Molvar Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J2475/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31573; Y10T428/31591
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
An article as defined in claim 1 wherein said substRate is formed of a polycarbonate resin.
Claim 2
Dependent Claim
16 words
An article as defined in claim 1 wherein said substrate is formed of an acrylic resin.
Claim 3
Dependent Claim
13 words
An article as defined in claim 1 wherein said isocyanate is hexamethylene diisocyanate.
Claim 4
Dependent Claim
22 words
The article as defined in claim 1 wherein said polyethylene glycol has a hydroxyl equivalent weight from about 100 to about 400.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |