US4098856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a composite mold for making polyurethane foam decorative parts
Assignee: Armstrong World Industries Inc
•
Filing: 1977-09-09
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Granted: 1978-07-04
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Expires: 1997-09-09
Abstract
Abstract A method for making a composite mold utilizing room temperature vulcanizing silicone rubber for the surface of the mold and room temperature vulcanizing polyurethane rubber for the rest of the mold.
Inventors
- 👤 Clifford M. Rosenau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:24
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/38; B29C33/3842; B29C33/3857; B29C33/40; B29C33/405; B29C35/00; B29C35/18; B29C2033/3864; B29K; B29K2875/00; B29K2883/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A method of making a composite rubber mold comprising the steps of: (a) spraying a silicone rubber compound on the surface of a master which is to be copied; (b) curing the silicone rubber covering over the master to be copied to form a layer with a thickness of 0.005 to 0.020 inches; (c) flame treating the back surface of the silicone rubber layer to make it receptive to bonding with other materials; (d) forming a solid non-compressible during molding use flexible polyurethane backing layer on the silicone rubber surface; and (e) permitting the composite plural layer mold to cure so that it may be subsequently used to mold articles in the shape of a master in the mold so constructed.
Claim 2
Independent Claim
121 words
A method of making a composite rubber mold comprising the steps of: (a) spraying a silicone rubber compound on the surface of a master which is to be copied; (b) curing the silicone rubber covering over the master to be copied to form a layer with a thickness of 0.005 to 0.020 inches; (c) flame treating the back surface of the silicone rubber layer to make it receptive to bonding with other materials; (d) forming a solid non-compressible during molding use flexible polyurethane backing layer on the silicone rubber surface; and (e) permitting the composite plural layer mold to cure so that it may be subsequently used to mold articles in the shape of a master in the mold so constructed.
Claim 3
Dependent Claim
34 words
The molding method of claim 1 wherein the sprayable silicone rubber coating is placed over the master which is to be copied with areas of various thickness for the silicone rubber coating so formed.
Claim 4
Dependent Claim
16 words
The molding method of claim 1 wherein the silicone rubber compound is applied as plural coats.
References Cited (Backward Citations)
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Cited
US3428725A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |