Patent US4824926A successfully refreshed from Google Patents.
US4824926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bilayer windshield with an abrasion and solvent resistant polyurethane protective coating
Assignee: PPG Industries Ohio Inc
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Filing: 1987-12-16
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Granted: 1989-04-25
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Expires: 2007-12-16
Abstract
Abstract An abrasion and solvent resistant polyurethane protective coating for bilayer windshields is formulated by the reaction of a polyester or polyether diol with an aliphatic isocyanate-terminated prepolymer.
Inventors
- 👤 James B. O'Dwyer
- 👤 Wen-Hsuan Chang
- 👤 Roger L. Scriven
- 👤 Joseph Cherenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:43
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/10165; B32B17/1033; B32B17/1055; B32B17/1077; C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/792; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8022; C08G18/8025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
An abrasion-resistant polyurethane coating composition comprising: a. a branched prepolymer having an isocyanate functionality greater that 2; and b. a hydroxy-terminated linear polymeric polyol selected from the group consisting of polyethers and polyesters having a molecular weight between 300 and 5,000.
Claim 2
Dependent Claim
41 words
An abrasion-resistant polyurethane coating composition comprising: a. a branched prepolymer having an isocyanate functionality greater that 2; and b. a hydroxy-terminated linear polymeric polyol selected from the group consisting of polyethers and polyesters having a molecular weight between 300 and 5,000.
Claim 3
Dependent Claim
16 words
An abrasion-resistant polyurethane coating composition according to claim 1, wherein said hydroxy-terminated polyol is a diol.
Claim 4
Dependent Claim
16 words
An abrasion-resistant polyurethane coating composition according to claim 2, wherein said diol is a polyether diol.
Claim 5
Dependent Claim
17 words
An abrasion-resistant polyurethane coating composition according to claim 3, wherein said polyether diol is polytetramethylene ether glycol.
Claim 6
Dependent Claim
16 words
An abrasion-resistant polyurethane coating composition according to claim 2, wherein said diol is a poyester diol.
Claim 7
Dependent Claim
17 words
An abrasion-resistant polyurethane coating composition according to claim 5, wherein said polyester diol is a polycaprolactone diol.
Claim 8
Dependent Claim
25 words
An abrasion-resistant polyurethane coating composition according to claim 1, wherein said branched prepolymer is an isocyanate-terminated prepolymer reaction product of a diisocyanate and a triol.
Claim 9
Dependent Claim
32 words
An abrasion-resistant polyurethane coating composition according to claim 7, wherein said isocyanate-terminated prepolymer is the reaction product of a diisocyanate selected from the group consisting of isophorone diisocyanate and methylene bis(cyclohexyl isocyanate).
Claim 10
Dependent Claim
23 words
An abrasion-resistant polyurethane coating composition according to claim 8, wherein said isocyanate-terminated prepolymer is the reaction product of a diisocyanate with trimethylol propane.
Claim 11
Dependent Claim
18 words
An abrasion-resistant polyurethane coating composition according to claim 1, further comprising ultraviolet light absorbing compound and antioxidant compound.
References Cited (Backward Citations)
US2047253A
Cited
US2184876A
Cited
US3806387A
Cited
US3781184A
Cited
US3916074A
Cited
US3808077A
Cited
US4232080A
Cited
US3900673A
Cited
US3958245A
Cited
US3979548A
Cited
US4059469A
Cited
US4112171A
Cited
US4039720A
Cited
US4643944A
Cited
US4242403A
Cited
US4174240A
Cited
US4584229A
Cited
US4609688A
Cited
US4600653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |