Patent US4771083A successfully refreshed from Google Patents.
US4771083A
Expired / Lapsed
US
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Micro cellular polyetherurethane shock absorber
Assignee: Goodyear Tire and Rubber Co
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Filing: 1987-02-17
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Granted: 1988-09-13
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Expires: 2007-02-17
Abstract
Abstract A micro cellular polyetherurethane foam of the aliphatic diisocyanate type suitable for use in shock absorbers.
Inventors
- 👤 George N. Altounian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/73; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G2110/00; C08G2110/0041; C08G2110/0066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
An improved polyetherurethane micro cellular foam bumper consisting essentially of a reaction product of a polyether polyol having from 2 to about 4 hydroxyl groups and an averaged value of about 2.0 to 2.1 with hexamethylene diisocyanate to form a prepolymer containing free NCO and curing said prepolymer in the presence of essentially sufficient curative to react with the free NCO in the presence of a gaseous blowing agent to yield a foam, said polyether polyol being a blend of 95 to 99 percent by weight of polytetramethylene ether glycol of about 1000 molecular weight and 5 to 1 percent of polyol of 3 to 4 hydroxyl of less than 300 molecular weight.
Claim 2
Dependent Claim
113 words
An improved polyetherurethane micro cellular foam bumper consisting essentially of a reaction product of a polyether polyol having from 2 to about 4 hydroxyl groups and an averaged value of about 2.0 to 2.1 with hexamethylene diisocyanate to form a prepolymer containing free NCO and curing said prepolymer in the presence of essentially sufficient curative to react with the free NCO in the presence of a gaseous blowing agent to yield a foam, said polyether polyol being a blend of 95 to 99 percent by weight of polytetramethylene ether glycol of about 1000 molecular weight and 5 to 1 percent of polyol of 3 to 4 hydroxyl of less than 300 molecular weight.
Claim 3
Dependent Claim
19 words
The polyetherurethane of claim 1 wherein the curative is a blend of polypropylene ether polyol and polytetramethylene ether glycol.
Claim 4
Dependent Claim
39 words
The bumber according to claim 1 wherein the bumber has a specific gravity of about 0.62, tear resistance of 9,000 to 11,000 N/M, tensile strength of 3,300 to 3,600 kPa and a permanent deformation of 9.4 to 9.9 percent.
Claim 5
Dependent Claim
111 words
A polyetherurethane micro cellular foam consisting essentially of a reaction product of a polyether polyol having from 2 to about 4 hydroxyl groups and an averaged value of about 2.0 to 2.1 with hexamethylene diisocyanate to form a prepolymer containing free NCO and curing said prepolymer in the presence of essentially sufficient curative to react with the free NCO in the presence of a gaseous blowing agent to yield a foam, said polyether polyol being a blend of 95 to 99 percent by weight of polytetramethylene ether glycol of about 1000 molecular weight and 5 to 1 percent of polyol of 3 to 4 hydroxyl of less than 300 molecular weight.
Claim 6
Dependent Claim
111 words
A polyetherurethane micro cellular foam consisting essentially of a reaction product of a polyether polyol having from 2 to about 4 hydroxyl groups and an averaged value of about 2.0 to 2.1 with hexamethylene diisocyanate to form a prepolymer containing free NCO and curing said prepolymer in the presence of essentially sufficient curative to react with the free NCO in the presence of a gaseous blowing agent to yield a foam, said polyether polyol being a blend of 95 to 99 percent by weight of polytetramethylene ether glycol of about 1000 molecular weight and 5 to 1 percent of polyol of 3 to 4 hydroxyl of less than 300 molecular weight.
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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |