Patent US3720540A successfully refreshed from Google Patents.
US3720540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of glass fiber-reinforced plastic articles
Assignee: Individual
•
Filing: 1970-07-14
•
Granted: 1973-03-13
•
Expires: 1990-07-14
Abstract
Abstract Glass fiber-reinforced plastic articles such as bathtubs are produced by shaping, e.g., vacuum forming, thermoplastic material such as acrylic sheeting into a body and then applying a sprayable mixture of thermosetting unsaturated polyester resin material and a bond-improving additive consisting of a monomeric styrene compound and chalk or talc to the body to form a coating thereon. Reinforcing glass fibers are embedded in the thermosetting coating which is cured to form the resultant reinforced plastic article. The coating and the reinforcing glass fibers are preferably applied using a ''''spray-up'''' system, i.e., coating by means of a spray gun.
Inventors
- 👤 R Wimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:38
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; B; B29; B29C; B29C70/00; B29C70/003; B29C70/0035; C08J7/043; C08J7/05; B29K; B29K2309/00; B29K2309/08; C08J2467/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A glass fiber-reinforced plastic article which comprises a layer of a resin selected from the group consisting of acrylic resins and acrylonitrile-butadiene-styrene resins; and a cured coating of sprayable thermosetting unsaturated polyester resin material, and a bond-improving additive of monomeric styrene compound and chalk or talc or a mixture thereof, said cured coating having embedded therein glass fibers and being in direct contact with at least a portion of said layer of said resin and being bonded thereto with improved strength.
Claim 2
Dependent Claim
81 words
A glass fiber-reinforced plastic article which comprises a layer of a resin selected from the group consisting of acrylic resins and acrylonitrile-butadiene-styrene resins; and a cured coating of sprayable thermosetting unsaturated polyester resin material, and a bond-improving additive of monomeric styrene compound and chalk or talc or a mixture thereof, said cured coating having embedded therein glass fibers and being in direct contact with at least a portion of said layer of said resin and being bonded thereto with improved strength.
Claim 3
Dependent Claim
24 words
An article according to claim 1 wherein said resin of said layer is selected from the group of methyl methacrylate, ethyl methacrylate, and acrylonitrile-butadiene-styrene.
Claim 4
Dependent Claim
91 words
A reinforced plastic article comprising a layer of an acrylic resin or an acrylonitrile-butadiene-styrene resin, and a cured coating of sprayable thermosetting unsaturated polyester resin material including a bond-improving additive of from 5 to 30 weight percent of monomeric styrene compound, from 5 to 50 weight percent of finely divided chalk or talc or a mixture thereof, and said cured coating having embedded therein glass fibers and being in direct contact with at least a portion of said layer of acrylic or acrylonitrile-butadiene-styrene resin and being bonded thereto with improved strength.
Claim 5
Dependent Claim
91 words
A reinforced plastic article comprising a layer of an acrylic resin or an acrylonitrile-butadiene-styrene resin, and a cured coating of sprayable thermosetting unsaturated polyester resin material including a bond-improving additive of from 5 to 30 weight percent of monomeric styrene compound, from 5 to 50 weight percent of finely divided chalk or talc or a mixture thereof, and said cured coating having embedded therein glass fibers and being in direct contact with at least a portion of said layer of acrylic or acrylonitrile-butadiene-styrene resin and being bonded thereto with improved strength.
Claim 6
Dependent Claim
36 words
An article according to claim 3 wherein the weight ratio of monomeric styrene compound to talc or chalk in said sprayable resin material is from 0.1 to 10 parts per one per part talc or chalk.
Claim 7
Dependent Claim
27 words
An article according to claim 3 wherein the resin of the said layer of resin is selected from the group of methyl methacrylate, ethyl methacrylate, and acrylonitrile-butadiene-styrene.
Claim 8
Dependent Claim
13 words
An article according to claim 1 wherein said resin is an acrylic resin.
Claim 9
Dependent Claim
13 words
An article according to claim 1 wherein said resin is an acrylonitrile-butadiene-styrene resin.
Claim 10
Dependent Claim
13 words
An article according to claim 3 wherein said layer is an acrylic resin.
Claim 11
Dependent Claim
14 words
An article according to claim 3 wherein said layer is of an acrylonitrile-butadiene-styrene resin.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |