US3615071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible mold
Assignee: Dow Silicones Corp
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Filing: 1969-04-16
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Granted: 1971-10-26
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Expires: 1989-04-16
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 THIS COATING OF THE COPOLYMER OF VINYLIDENE CHLORIDE AND ACRYLONITRILE ON THE SURFACE. THIS PROCESS EXTENDS THE USEFUL LIFE OF THE MOLD.
Inventors
- 👤 Jack R Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:19
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0025; B29C37/0028; B29C37/0032; B29C33/00; B29C33/0011; B29C33/38; B29C33/40; B29C33/405; B29C33/56; B29C33/60; B29C33/62; B29C35/00; B29C35/18; B29C39/00; B29C39/02; B29C39/12; B29C39/123; B29C2037/0035; B29K; B29K2063/00; B29K2067/00; B29K2067/06; B29K2075/00; B29K2875/00; B29K2883/00; Y; Y10; Y10S; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 0
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |