Patent US4185341A successfully refreshed from Google Patents.
US4185341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Support appliance
Assignee: BTG International Ltd
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Filing: 1979-01-23
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Granted: 1980-01-29
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Expires: 1999-01-23
Abstract
Abstract A mattress of resilient foam has a separate cover formed from a chemically/physico-chemically porous material to transmit water/vapor on the outer side of the surface, due to differential water vapor pressure to within the mattress from which it can disperse.
Inventors
- 👤 John T. Scales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:53
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/14; A47C21/00; A47C21/04; A47C21/042; A47C21/044; A61; A61G; A61G7/00; A61G7/05; A61G7/057
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A method of using a support appliance, which appliance comprises a resilient air permeable body capable of supporting a user, and a cover extending over at least that portion of the body which supports the user, the cover comprising a material which is free-water proof but is chemically/physico-chemically porous to permit transmission of gaseous water vapour on the outside of said portion of the surface area to within the body and from which the water vapour can be dispersed when subjected to a differential water vapour pressure, said method comprising supporting a user on said appliance and relying solely on the effects of the weight and movements of the user thereupon to cause said transmission and dispersal of gaseous water vapour.
Claim 2
Independent Claim
121 words
A method of using a support appliance, which appliance comprises a resilient air permeable body capable of supporting a user, and a cover extending over at least that portion of the body which supports the user, the cover comprising a material which is free-water proof but is chemically/physico-chemically porous to permit transmission of gaseous water vapour on the outside of said portion of the surface area to within the body and from which the water vapour can be dispersed when subjected to a differential water vapour pressure, said method comprising supporting a user on said appliance and relying solely on the effects of the weight and movements of the user thereupon to cause said transmission and dispersal of gaseous water vapour.
Claim 3
Independent Claim
143 words
A method of using a support appliance which appliance comprises a resilient air permeable body, a covering extending over at least that portion of the body which supports the user, the cover comprising a material which is free-water proof but is chemically/physico-chemically porous to permit transmission of gaseous water vapour on the outside of said portion of the surface area to within the body and from which the water vapour can be dispersed when subjected to a differential water vapour pressure, and means for supplying a flow of gas through the body, said method comprising supporting a user on said appliance, activating said gas supply means but without inflating said body, relying only on the effects of the weight and movement of the user upon said body, together with said gas flow therethrough to cause said transmission and dispersal of gaseous water vapour.
Claim 4
Independent Claim
143 words
A method of using a support appliance which appliance comprises a resilient air permeable body, a covering extending over at least that portion of the body which supports the user, the cover comprising a material which is free-water proof but is chemically/physico-chemically porous to permit transmission of gaseous water vapour on the outside of said portion of the surface area to within the body and from which the water vapour can be dispersed when subjected to a differential water vapour pressure, and means for supplying a flow of gas through the body, said method comprising supporting a user on said appliance, activating said gas supply means but without inflating said body, relying only on the effects of the weight and movement of the user upon said body, together with said gas flow therethrough to cause said transmission and dispersal of gaseous water vapour.
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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |