US4906466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver compound antimicrobial compositions
Assignee: Johnson Matthey PLC
•
Filing: 1987-07-01
•
Granted: 1990-03-06
•
Expires: 2007-07-01
Abstract
Abstract An antimicrobial composition for topical use or for incorporation into a coating or structural composition comprises an antimicrobial silver compound, preferably silver chloride, deposited on a physiologically inert oxidic synthetic particulate support material in particulate form. A preferred support material is titania containing one or more of the crystalline forms anatase, rutile, and brookite.
Inventors
- 👤 Neil Edwards
- 👤 Stephen B. Mitchell
- 👤 Allin S. Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:21
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/14; A61L29/16; A01; A01N; A01N59/00; A01N59/16; A61L17/00; A61L17/005; A61L27/00; A61L27/50; A61L27/54; A61L2300/00; A61L2300/10; A61L2300/102; A61L2300/104; A61L2300/40; A61L2300/404; A61L2300/60; A61L2300/62; A61L2300/622
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
An antimicrobial composition comprising an antimicrobial silver compound deposited on a support in which the silver compound is present at a level from 1-75% by weight of the support, wherein the support comprises a physiologically inert oxidic synthetic material in particulate form and having an extended surface area, in which the support material is selected from oxides of titanium, magnesium, aluminum, silicon, cerium, zirconium, hafnium, niobium and tantalum, calcium hydroxyapatite and barium sulphate and said silver compound is selected from the group consisting of AgCl, AgBr, Ag 2 CO 3 , AgOH and Ag 3 PO 4 .
Claim 2
Dependent Claim
98 words
An antimicrobial composition comprising an antimicrobial silver compound deposited on a support in which the silver compound is present at a level from 1-75% by weight of the support, wherein the support comprises a physiologically inert oxidic synthetic material in particulate form and having an extended surface area, in which the support material is selected from oxides of titanium, magnesium, aluminum, silicon, cerium, zirconium, hafnium, niobium and tantalum, calcium hydroxyapatite and barium sulphate and said silver compound is selected from the group consisting of AgCl, AgBr, Ag 2 CO 3 , AgOH and Ag 3 PO 4 .
Claim 3
Dependent Claim
25 words
A composition according to claim 1, in which the support material comprises titania containing one or more of the crystalline forms anatase, rutile and brookite.
Claim 4
Dependent Claim
20 words
A composition according to any preceding claim, in which the support material has a particle size less than 25 microns.
Claim 5
Dependent Claim
25 words
A composition according to any preceding claim, in which the surface area of the support is in the range 1-240 m 2 g -1 .
Claim 6
Dependent Claim
14 words
A composition according to claim 1, in which the silver compound comprises silver chloride.
Claim 7
Dependent Claim
64 words
An antimicrobial coating or structural composition comprising an effective amount of an antimicrobial silver compound selected from the group consisting of AgCl, AgBr, Ag 2 CO 3 , AgOH and Ag 3 PO 4 , said compound being deposited on a physiologically inert oxidic synthetic support material in particulate form and having an extended surface area, the composition being dispersed in a polymeric material.
Claim 8
Dependent Claim
64 words
An antimicrobial coating or structural composition comprising an effective amount of an antimicrobial silver compound selected from the group consisting of AgCl, AgBr, Ag 2 CO 3 , AgOH and Ag 3 PO 4 , said compound being deposited on a physiologically inert oxidic synthetic support material in particulate form and having an extended surface area, the composition being dispersed in a polymeric material.
Claim 9
Independent Claim
86 words
A method for reducing the level of microorganisms in a zone of biological fluid in proximity to a surface, the method comprising applying to the surface an effective amount of an antimicrobial composition comprising a silver compound selected from the group consisting of AgCl, AgBr, Ag 2 CO 3 , AgOH and Ag 3 PO 4 , said compound being deposited on a physiologically inert oxidic synthetic support material having an extended surface area, and bringing the treated surface into contact with the said biological fluid.
Claim 10
Independent Claim
86 words
A method for reducing the level of microorganisms in a zone of biological fluid in proximity to a surface, the method comprising applying to the surface an effective amount of an antimicrobial composition comprising a silver compound selected from the group consisting of AgCl, AgBr, Ag 2 CO 3 , AgOH and Ag 3 PO 4 , said compound being deposited on a physiologically inert oxidic synthetic support material having an extended surface area, and bringing the treated surface into contact with the said biological fluid.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |