US3653383A
Expired / Lapsed
US
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Algin sponge and process therefor
Assignee: Freeze Dry Products Inc
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Filing: 1969-07-30
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Granted: 1972-04-04
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Expires: 1989-07-30
Abstract
Abstract Water-absorbent and water-disintegrative open-celled porous algin sponges are provided, which sponges may be used as medical receptors for biological fluids. The process for making the water-absorbent and water-disintegrative algin sponge includes freezing an algin dispersion, such as a gel of sodium alginate and calcium alginate, and thereafter sublimating the frozen dispersion medium.
Inventors
- 👤 Raymond G Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61F; A61F13/00; A61F13/01; A61F13/01034; A61F13/01042; A61L15/60; A61F13/15; A61F13/15203; A61F13/15211; A61F2013/00089; A61F2013/00157; A61F2013/00217; A61F2013/00229; A61F2013/00246; A61F2013/00255; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00855; A61F2013/00863; A61F13/15577; A61F2013/15821; A61F13/53; A61F2013/530802
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The algin open-celled, porous sponge of claim 1 in the form of a medical receptor for biological fluids.
Claim 2
Dependent Claim
17 words
The algin open-celled, porous sponge of claim 2 having an absorptive capacity of greater than 5,000 percent.
Claim 3
Dependent Claim
58 words
An algin sponge comprising at least one water-soluble alginate and at least one water-insoluble alginate, said algin sponge having an open-celled structure, said algin sponge being water-absorptive, said algin sponge being water-disintegrative, said algin sponge having a moisture content of less than 90 percent, and said algin sponge further having a density between about 0.01 and 1 g/cc.
Claim 4
Dependent Claim
18 words
The algin open-celled porous sponge of claim 4 in the form of a medical receptor for biological fluids.
Claim 5
Dependent Claim
68 words
An algin sponge, said algin sponge consisting essentially of calcium alginate and sodium alginate, said algin sponge having an open-celled porous dehydrated gel structure, said algin sponge having a density between about 0.01 and 0.1 g/cc, said algin sponge having a moisture content of less than 5 percent, said algin sponge having an absorptive capacity for water of greater than 5,000 percent, and said algin sponge being water-disintegrative.
Claim 6
Dependent Claim
22 words
The open-celled, porous sponge of claim 4 in which the water-soluble alginate is sodium alginate and the water-insoluble alginate is calcium alginate.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |