US4959341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable superabsorbing sponge
Assignee: Novavax Inc
•
Filing: 1989-03-09
•
Granted: 1990-09-25
•
Expires: 2009-03-09
Abstract
Abstract A new superabsorber which gels and cross-links as hydrated has been developed. The superabsorber contains a branched-chain polyanionic carbohydrate such as carboxymethylcellulose, a cross-linking agent, and a hydrophobic carboxylic acid. The superabsorber is biodegradable and non-toxic.
Inventors
- 👤 Donald F. H. Wallach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:26
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61L15/42; A61L15/60; A61F13/15203; A61F13/15252; A61F13/53; A61F2013/530481; A61F2013/530583; A61F2013/530649; A61F2013/530795; A61F13/534; A61F2013/53481; A61F13/84; A61F13/8405; A61F2013/8438; A61F2013/8447; A61F2013/8452
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
52 words
A composition of matter which acts as a synthetic sponge when allowed to hydrate comprising a non-hydrated mixture of: a carboxylic acid with a substantial hydrophobic region; a branched complex carbohydrate; and a separate cross-linking agent; whereby said composition can be hydrated and cross-linked simultaneously in the presence of a hydrating solution.
Claim 2
Dependent Claim
52 words
A composition of matter which acts as a synthetic sponge when allowed to hydrate comprising a non-hydrated mixture of: a carboxylic acid with a substantial hydrophobic region; a branched complex carbohydrate; and a separate cross-linking agent; whereby said composition can be hydrated and cross-linked simultaneously in the presence of a hydrating solution.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein said carboxylic acid comprises a fatty acid.
Claim 4
Dependent Claim
27 words
The composition of claim 2 wherein said fatty acid is selected from the group consisting of lauric acid, palmitic acid, stearic acid, oleic acid, and mixtures thereof.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein said carboxylic acid comprises a functional fatty acid.
Claim 6
Dependent Claim
23 words
The composition of claim 4 wherein said functional fatty acid is selected from the group consisting of arachidonic acid, prostaglandins, prostacyclins and thromboxanes.
Claim 7
Dependent Claim
20 words
The composition of claim 1 wherein said branched complex carbohydrate is selected from the group consisting of carboxymethylcellulose and chitosan.
Claim 8
Dependent Claim
10 words
The composition of claim 1 further comprising a linear carbohydrate.
Claim 9
Dependent Claim
21 words
The composition of claim 1 wherein said cross-linking agent is a metallo-organic cross-linking agent which includes a multivalent metal ion. PG,31
Claim 10
Dependent Claim
31 words
The composition of claim 8 wherein said multivalent metal ion is selected from the group consisting of aluminum ions, chromium ions, and other metal ions with a valence greater than 2.
Claim 11
Dependent Claim
16 words
The composition of claim 8 wherein said metallo-organic cross-linking agent also acts as said cross-linking agent.
Claim 12
Dependent Claim
25 words
The composition of claim 1 wherein said cross-linking agent is an organic cross-linking agent containing a metal having an effective valence of at least 3.
Claim 13
Dependent Claim
65 words
The composition of claim 2 wherein said fatty acid is selected from the group consisting of a lauric, palmitic, oleic, and stearic acids, said branched complex carbohydrate is selected from the group consisting of carboxymethylcellulose, chitosan, and mixtures thereof, and said cross-linking agent is selected from the group consisting of aluminum acetate, aluminum borate, benzoate-based aluminum metallo-organic complex, palmitate-based aluminum metallo-organic complex, and mixtures thereof.
Claim 14
Dependent Claim
42 words
A composition of matter which acts as a synthetic sponge when allowed to hydrate comprising a non-hydrated mixture of: undecylenic acid; and a branched complex carbohydrate; whereby said composition can be hydrated and cross-linked simultaneously in the presence of a hydrating solution.
Claim 15
Dependent Claim
42 words
A composition of matter which acts as a synthetic sponge when allowed to hydrate comprising a non-hydrated mixture of: undecylenic acid; and a branched complex carbohydrate; whereby said composition can be hydrated and cross-linked simultaneously in the presence of a hydrating solution.
Claim 16
Dependent Claim
12 words
The composition of claim 1 wherein said carboxylic acid comprises benzoic acid.
References Cited (Backward Citations)
US4160063A
Cited
US3969280A
Cited
US4090013A
Cited
CA1152483A
Cited
US4454055A
Cited
US4486335A
Cited
US4610678A
Cited
US4548847A
Cited
US4786415A
Cited
US4812486A
Cited
US4826880A
Cited
US4826880B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |