Patent US4482582A successfully refreshed from Google Patents.
US4482582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyurethane product having improved load bearing characteristics
Assignee: Individual
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Filing: 1984-03-23
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Granted: 1984-11-13
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Expires: 2004-03-23
Abstract
Abstract A modified low-density flexible polyurethane foam product having a relatively high degree of firmness as well as commercially acceptable dielectric heat sealing characteristics. The product formulation includes an intermediate constituted by a mixture of polyol and a polymer/polyol in a ratio imparting to the product a predetermined degree of firmness, and a thermoplastic additive whose dielectric loss index is greater than the loss index of polyurethane foam to impart to the product an acceptable dielectric heating response in a high frequency electric field. This response is enhanced by acrylonitrile/styrene components included in the polymer/polyol.
Inventors
- 👤 Morey Weisman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:44
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4072; C08J2375/00; C08J2375/04; C08J2427/00; Y; Y10; Y10S; Y10S521/00; Y10S521/918; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
The method of enhancing the dielectric heat sealing characteristics of an open cell polyurethane foam product, comprising the steps of: A feeding powders of a plastic material whose dielectric loss index is greater than that of polyurethane and water vapor into a pressurized stream of air which is projected at relatively high velocity to fluidize the powders and disperse the vapors; and B directing the stream toward the surface of the product to cause the powders and vapor conveyed thereby to impregnate the cells at the surface of said open celled polyurethane foam product.
Claim 2
Independent Claim
94 words
The method of enhancing the dielectric heat sealing characteristics of an open cell polyurethane foam product, comprising the steps of: A feeding powders of a plastic material whose dielectric loss index is greater than that of polyurethane and water vapor into a pressurized stream of air which is projected at relatively high velocity to fluidize the powders and disperse the vapors; and B directing the stream toward the surface of the product to cause the powders and vapor conveyed thereby to impregnate the cells at the surface of said open celled polyurethane foam product.
Claim 3
Dependent Claim
16 words
The method as set forth in claim 1, wherein said vapor is derived from distilled water.
Claim 4
Dependent Claim
15 words
The method as set forth in claim 1, wherein said powders are of polyvinyl chloride.
Claim 5
Dependent Claim
15 words
The method as set forth in claim 1, wherein said powders are of polyvinyl acetate.
Claim 6
Dependent Claim
14 words
The method as set forth in claim 1, wherein said powders are of polymethylmethacrylate.
Claim 7
Dependent Claim
16 words
The method as set forth in claim 1, wherein said powders are of phenol formaldehyde resin.
Claim 8
Dependent Claim
16 words
The method as set forth in claim 1, wherein said powders are of urea formaldehyde resin.
Claim 9
Dependent Claim
15 words
The method as set forth in claim 1, wherein said powders are of acrylonitrile resin.
Claim 10
Dependent Claim
31 words
The method as set forth in claim 1, wherein said polyurethane foam product is derived from a formulation including an intermediate constituted by a mixture of a polyol and a polymer/polyol.
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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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |