Patent US3801430A successfully refreshed from Google Patents.
US3801430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding a flexible mold
Assignee: Dow Silicones Corp
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Filing: 1970-10-12
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Granted: 1974-04-02
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Expires: 1990-10-12
Abstract
Abstract A method of forming shaped articles of polyester, polyurethane or epoxy resin by using a flexible mold wherein a thin continuous film of a methyl ethyl ketone soluble copolymer of vinylidene chloride and acrylonitrile is applied to the shape forming surface of the flexible mold prior to molding an article is disclosed. This process provides a shaped article having a thin coating of the copolymer of vinylidene chloride and acrylonitrile on the surface. This process extends the useful life of the mold.
Inventors
- 👤 J Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:11
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/38; B29C33/40; B29C33/405; B29C33/56; B29C33/60; B29C33/62; B29C37/00; B29C37/0025; B29C37/0028; B29C37/0032; B29C2037/0035; B29K; B29K2875/00; B29K2883/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31573; Y10T428/3158; Y10T428/31583; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
The shaped article in accordance with claim 1, in which the polymeric material is polyester.
Claim 2
Dependent Claim
15 words
The shaped article in accordance with claim 1, in which the polymeric material is polyurethane.
Claim 3
Dependent Claim
16 words
The shaped article in accordance with claim 1, in which the polymeric material is epoxy resin.
Claim 4
Dependent Claim
25 words
The shaped article in accordance with claim 1 in which the thin continuous coating of the copolymer of vinylidene chloride and acrylonitrile contains a pigment.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |