Patent US3234969A successfully refreshed from Google Patents.
Patent US4072673A successfully refreshed from Google Patents.
US4072673A
Expired / Lapsed
US
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Method for making a flexible mold
Assignee: Goodyear Tire and Rubber Co
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Filing: 1971-11-08
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Granted: 1978-02-07
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Expires: 1991-11-08
Abstract
Abstract This invention relates to a flexible mold and a process of making wherein a composition or laminate is formed to give the mold the desired solvent resistance and yet maintain its flexibility.
Inventors
- 👤 Peter C. Lammers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; B; B29; B29C; B29C33/00; B29C33/0011; B29C33/38; B29C33/3842; B29C33/3857; B29C33/40; B29K; B29K2875/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A method of making a flexible mold comprising the steps of 1. forming a film of a hydrocarbon polyurethane of about 10-100 mils in thickness on a model, said hydrocarbon polyurethane comprising the reaction product of a hydrocarbon polyol and an organic polyisocyanate, 2. placing the model with the film thereon in the cavity of a retaining mold having a clearance of at least 0.1 inches between the film on the model and the surface of the cavity of said retaining mold, 3. filling said clearance with a liquid polyetherurethane or polyesterurethane reaction mixture and reacting said mixture to form a polyurethane layer adhered to said film to form a flexible mold, and 4. removing the mold from the retaining mold and model.
Claim 2
Independent Claim
123 words
A method of making a flexible mold comprising the steps of 1. forming a film of a hydrocarbon polyurethane of about 10-100 mils in thickness on a model, said hydrocarbon polyurethane comprising the reaction product of a hydrocarbon polyol and an organic polyisocyanate, 2. placing the model with the film thereon in the cavity of a retaining mold having a clearance of at least 0.1 inches between the film on the model and the surface of the cavity of said retaining mold, 3. filling said clearance with a liquid polyetherurethane or polyesterurethane reaction mixture and reacting said mixture to form a polyurethane layer adhered to said film to form a flexible mold, and 4. removing the mold from the retaining mold and model.
Claim 3
Dependent Claim
118 words
A flexible mold having a shaping face formed of a film of a hydrocarbon polyurethane of about 10 to 100 mils in thickness and having a flexible layer of a polyurethane of a polyester or a polyether polyol adhered to the other side of the film to give a laminate of at least a tenth of an inch thick, said hydrocarbon polyurethane being the reaction product of an organic diisocyanate, a hydrocarbon polyol of 2 to 3 hydroxyl groups and an organic diamine, said hydrocarbon polyol being hydroxyl terminated polymers of a conjugated diene of 4 to 10 carbon atoms or a copolymer of said diene and styrene, and the flexible layer being a polyetherurethane or a polyesterurethane.
Claim 4
Dependent Claim
118 words
A flexible mold having a shaping face formed of a film of a hydrocarbon polyurethane of about 10 to 100 mils in thickness and having a flexible layer of a polyurethane of a polyester or a polyether polyol adhered to the other side of the film to give a laminate of at least a tenth of an inch thick, said hydrocarbon polyurethane being the reaction product of an organic diisocyanate, a hydrocarbon polyol of 2 to 3 hydroxyl groups and an organic diamine, said hydrocarbon polyol being hydroxyl terminated polymers of a conjugated diene of 4 to 10 carbon atoms or a copolymer of said diene and styrene, and the flexible layer being a polyetherurethane or a polyesterurethane.
References Cited (Backward Citations)
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |