Patent US4172870A successfully refreshed from Google Patents.
US4172870A
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US
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Method for permitting release of molded articles in the absence of a release agent other than a coating of zero grain soft water on the mold
Assignee: APACHE PRODUCTS COMPANY A FL CORP
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Filing: 1975-03-12
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Granted: 1979-10-30
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Expires: 1995-03-12
Abstract
Abstract A method of releasing molded articles from a mold by coating the mold with zero grain soft water prior to insertion of the material to be molded into the mold, zero grain soft water meaning the substantially total absence of divalent ions, such as calcium or magnesium, in the water.
Inventors
- 👤 William E. Whitchurch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:35
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B29C33/00; B29C33/56; B29C33/60; B29K; B29K2075/00; Y; Y10; Y10S; Y10S264/00; Y10S264/77
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
In a method of molding articles from a moldable material within a mold, the improvement which comprises applying a coating of zero grain soft water to the molding surfaces of the mold prior to application of the moldable material into the mold, thereafter molding the moldable material within the mold, and then releasing the molded material from the mold in the absence of any release agent other then said zero grain soft water.
Claim 2
Dependent Claim
73 words
In a method of molding articles from a moldable material within a mold, the improvement which comprises applying a coating of zero grain soft water to the molding surfaces of the mold prior to application of the moldable material into the mold, thereafter molding the moldable material within the mold, and then releasing the molded material from the mold in the absence of any release agent other then said zero grain soft water.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said moldable material comprises a moldable mixture of a resin capable of condensation polymerization with an isocyanate, a catalyst, a surfactant and a foaming agent.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the molded material is polyurethane.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the material to be molded comprises a pair of opposed backing sheets between which is deposited a liquid foamable resin mixture.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein said resin mixture forms a rigid foam between said backing sheets while in the mold.
Claim 7
Dependent Claim
11 words
The method of claim 5 wherein said rigid foam is polyurethane.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein said mold comprises a pair of opposed traveling conveyors, the molding surfaces being formed by the opposed surfaces of the conveyors.
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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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |