Patent US4874640A successfully refreshed from Google Patents.
US4874640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact absorbing composites and their production
Assignee: PSA Inc
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Filing: 1988-01-07
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Granted: 1989-10-17
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Expires: 2008-01-07
Abstract
Abstract An improved composite for absorbing and dispersing impacting forces is disclosed. The composite includes a flexible plastic enclosure defining an internal cavity. The flexible enclosure is generally impermeable to air and capable of having its internal pressure changed. The composite further includes a foam core filling the cavity and retained within the cavity and adhered on substantially all of its external surface to the internal surface of the cavity. The cavity can be pressurized for higher impact absorbance. Methods for fabricating the composites are disclosed, as well. These methods include forming the outer enclosure by applying a solution/suspension of the prepolymer of controlled solids content to the core and also can include the step of preheating the core prior to coating it.
Inventors
- 👤 Byron A. Donzis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:03
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/37; A; A41; A41D; A41D31/00; A41D31/04; A41D31/28; A41D31/285; B; B32; B32B; B32B3/00; B32B3/26; B60; B60R; B60R21/00; B60R21/02; B60R21/04; B60R21/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A method for producing a shock-absorbing composite for absorbing and dispersing impacting forces comprising forming a flexible foam core shaped and sized as required for said shock-absorbing composite, applying to the outer surface of said core a layer of prepolymer solution/suspension, curing the layer of prepolymer solution/suspension to yield a flexible plastic layer thereby forming a flexible enclosure surrounding and adhered on all sides to said core, said flexible enclosure being capable of having its internal pressure changed.
Claim 2
Independent Claim
78 words
A method for producing a shock-absorbing composite for absorbing and dispersing impacting forces comprising forming a flexible foam core shaped and sized as required for said shock-absorbing composite, applying to the outer surface of said core a layer of prepolymer solution/suspension, curing the layer of prepolymer solution/suspension to yield a flexible plastic layer thereby forming a flexible enclosure surrounding and adhered on all sides to said core, said flexible enclosure being capable of having its internal pressure changed.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said applying is carried out by dipping and wherein the solution/suspension is a suspension having a solids content of at least about 50% by weight.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said suspension has a solids content of from about 50% by weight to about 75% by weight.
Claim 5
Dependent Claim
42 words
The method of claim 1 wherein the core is preheated to a temperature above ambient prior to applying to its outer surface the layer of prepolymer solution/suspension and wherein said core is at a temperature above ambient during application of the layer.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein the preheat temperature is a temperature between 80° F. and the thermal decomposition temperature of the core.
Claim 7
Dependent Claim
18 words
The method of claim 4 wherein the preheat temperature is a temperature between 90° F. and 250° F.
Claim 8
Dependent Claim
13 words
The method of claim 6 wherein the core is an open-celled foam core.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein the applying is effected by spraying.
Claim 10
Dependent Claim
31 words
The method of claim 6 wherein said applying is carried out by dipping and wherein the solution/suspension is a suspension having a solids content of at least about 50% by weight.
Claim 11
Dependent Claim
23 words
The method of claim 9 wherein said suspension has a solids content of from about 50% by weight to about 75% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |