US3789100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding objects from rapid-setting polyurethane compositions
Assignee: Dow Chemical Co
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Filing: 1972-06-19
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Granted: 1974-01-29
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Expires: 1992-06-19
Abstract
Abstract Molded polyurethane objects are prepared from rapid-setting polyurethane compositions employing molds prepared from foamed polymers of vinyl aromatic compounds. The molds retain their shape and dimensions sufficiently for the polyurethane composition to solidify and then the mold distorts and shrinks away from the molded object.
Inventors
- 👤 E Kropscott
- 👤 G Wittenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/38; B29C33/40; B29C33/44; B29C33/448; B29C44/00; B29C44/34; B29C44/58; B29C61/00; B29K; B29K2075/00; B29K2825/00; Y; Y10; Y10S; Y10S264/00; Y10S264/44
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The process of claim 2 wherein said polyurethane composition rapidly solidifies and maintains the shape provided by the mold within less than about 3 minutes.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the vinyl aromatic compound is a compound represented by the formula
Claim 3
Dependent Claim
21 words
The process of claim 3 wherein said polymer is a copolymer of any two or more of such vinyl aromatic compounds.
Claim 4
Dependent Claim
10 words
The process of claim 3 wherein said polymer is polystyrene.
Claim 5
Dependent Claim
38 words
The process of claim 3 wherein said polymer is a copolymer comprising in major proportion a vinyl aromatic compound or mixture of vinyl aromatic compounds and a minor portion of a vinyl monomer or mixture of vinyl monomers.
Claim 6
Dependent Claim
18 words
The process of claim 6 wherein said vinyl monomer is acrylonitrile and the vinyl aromatic compound is styrene.
Claim 7
Dependent Claim
14 words
The process of claim 7 wherein said polymer comprises 27% acrylonitrile and 63% styrene.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |