US4768250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bead bed
Assignee: Fuji Electric Co Ltd
•
Filing: 1987-07-10
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Granted: 1988-09-06
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Expires: 2007-07-10
Abstract
Abstract A fluidized bead bed includes a mattress having an outer, liquid-impermeable layer to prevent body fluids from passing into a bed tub holding fluidized beads and contaminating the beads. The bed tub includes apertures near its upper edges to exhaust pressurized air from the bed tub.
Inventors
- 👤 Shigeya Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/08; A47C27/086; A61; A61G; A61G7/00; A61G7/05; A61G7/057; A61G7/05738; A61G7/05746
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A fluidized bead bed comprising: a bed tub having side walls and a peripheral edge forming an upper opening and having air exhaust apertures formed in said side walls proximate said opening and below said peripheral edge; a plurality of beads in said tub; a means for supplying compressed air to said tub to fluidize said beads therein; and a flexible, liquid imperamable support member covering said opening, said support member including a liquid impermable sheet covering said opening and an air permeable mattress member attached at the undersurface of said sheet, support member being anchored to said peripheral edge and being adapted to prevent said beads from passing through said opening when said supplying means supplies compressed air to fluidize said beads, said compressed air flowing through said beads and said mattress and being exhausted through said air exhaust apertures.
Claim 2
Dependent Claim
141 words
A fluidized bead bed comprising: a bed tub having side walls and a peripheral edge forming an upper opening and having air exhaust apertures formed in said side walls proximate said opening and below said peripheral edge; a plurality of beads in said tub; a means for supplying compressed air to said tub to fluidize said beads therein; and a flexible, liquid imperamable support member covering said opening, said support member including a liquid impermable sheet covering said opening and an air permeable mattress member attached at the undersurface of said sheet, support member being anchored to said peripheral edge and being adapted to prevent said beads from passing through said opening when said supplying means supplies compressed air to fluidize said beads, said compressed air flowing through said beads and said mattress and being exhausted through said air exhaust apertures.
Claim 3
Dependent Claim
28 words
A fluidized bead bed according to claim 1, further including an air permeable filter sheet substantially impenetrable by said beads attached to the lower surface of said mattress.
Claim 4
Dependent Claim
25 words
A fluidized bead bed according to claim 1, wherein said air exhaust aperatures are open to an ambient environment proximate the outside of the bed.
Claim 5
Dependent Claim
16 words
A fluidized bead bed according to claim 1, wherein said mattress includes an air permeable filter.
Claim 6
Dependent Claim
18 words
A fluidized bead bed according to claim 1, wherein said liquid impermeable sheet is substantially impermeable to air.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |