Patent US3670070A successfully refreshed from Google Patents.
US3670070A
Expired / Lapsed
US
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Processes for molding polyurethane foam articles
Assignee: USM Corp
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Filing: 1968-12-17
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Granted: 1972-06-13
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Expires: 1988-12-17
Abstract
Abstract Process for molding polyurethane foam articles, particularly for molding polyurethane foam outsoles onto shoe uppers in which relative speeds of development of foam and viscosity in the mixture are controlled through a coaction of mixed catalysts in the reactive mixture.
Inventors
- 👤 Daniel Appleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; B; B29; B29K; B29K2075/00; B29K2105/00; B29K2105/04; B29L; B29L2031/00; B29L2031/48; B29L2031/50; B29L2031/504
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
The method as defined in claim 1 in which a shoe upper is assembled with its bottom portion against a tread member-forming mold to define said molding chamber, said reaction mixture is brought into wetting adhesive engagement with said bottom portion through expansion of said reaction mixture during said induction period, said reaction mixture is converted to a resilient polyurethane foam tread member adhering to said bottom portion in said post-induction period and said shoe upper with said polyurethane foam tread member adhered to it are removed from engagement with the mold.
Claim 2
Dependent Claim
32 words
The method as defined in claim 2 in which said blowing agent is a volatile organic liquid having a boiling point below the temperature of the reaction mixture during said induction period.
Claim 3
Dependent Claim
47 words
The method as defined in claim 2 in which said reaction mixture includes water, said blowing agent is gas generated by reaction of water and -NCO and in which a third catalyst is included to accelerate the reaction of water with isocyanate to generate said blowing gas.
Claim 4
Dependent Claim
31 words
The method as defined in claim 4 in which said third catalyst is a member of the group consisting of dibutyl tin dilaurate, triethylene amine, N-methyl morpholine and N ethyl morpholine.
Claim 5
Dependent Claim
26 words
The method as defined in claim 2 in which said organic diol (A) is selected from the group consisting of polyester diols and polyalkylene ether diols.
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |