US5541233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable anti-microbial agent
Assignee: 3M Co
•
Filing: 1994-09-06
•
Granted: 1996-07-30
•
Expires: 2014-09-06
Abstract
Abstract A water absorbing porous article comprising a sponge and a metal complex is disclosed The metal complex comprises a metal ion, at least one chelating polymer chelated to the metal ion and at least one potentiator chelated to the metal ion. The chelating polymer in a preferred embodiment is chitosan.
Inventors
- 👤 Karl F. Roenigk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:47
CPC Classifications
A; A01; A01N; A01N43/00; A01N43/34; A01N43/40; A01N25/00; A01N25/08; A01N25/10; A01N25/34; A01N43/02; A01N43/04; A01N43/14; A01N43/16; A01N43/48; A01N43/50; A01N43/52; A01N43/72; A01N43/74; A01N43/78; A01N57/00; A01N57/10; A01N57/14; A01N59/00; A01N59/06; A01N59/16; A01N59/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A water-absorbing porous article comprising: a. a sponge; b. an effective amount of at least one metal complex which is dispersed within said sponge and comprises chitosan as a chelating polymer, one or more metal ions chelated to said chelating polymer and at least one anti-microbial potentiator chelated to said metal ion to prevent microbial growth within said sponge, said metal ion being selected from the group consisting of a transition metal ion, a non-transition metal ion capable of existing in more than one valence state, zinc and aluminum.
Claim 2
Dependent Claim
89 words
A water-absorbing porous article comprising: a. a sponge; b. an effective amount of at least one metal complex which is dispersed within said sponge and comprises chitosan as a chelating polymer, one or more metal ions chelated to said chelating polymer and at least one anti-microbial potentiator chelated to said metal ion to prevent microbial growth within said sponge, said metal ion being selected from the group consisting of a transition metal ion, a non-transition metal ion capable of existing in more than one valence state, zinc and aluminum.
Claim 3
Dependent Claim
37 words
A water-absorbing porous article comprising: a. a sponge; b. an effective amount of at least one metal complex which is dispersed within said sponge and comprises chitosan, zinc and pyrithione to prevent microbial growth within said sponge.
Claim 4
Dependent Claim
37 words
A water-absorbing porous article comprising: a. a sponge; b. an effective amount of at least one metal complex which is dispersed within said sponge and comprises chitosan, zinc and pyrithione to prevent microbial growth within said sponge.
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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) | 1999-07-30 | 2000-01-29 | 2000-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-30 | 2004-01-29 | 2004-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-30 | 2008-01-29 | 2008-07-30 | $7700.00 | Window Closed / Lapsed |