US5009898A
Expired / Lapsed
US
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Antimicrobial hydroxyapatite powders and methods for preparing them
Assignee: Sangi Co Ltd
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Filing: 1989-09-19
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Granted: 1991-04-23
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Expires: 2009-09-19
Abstract
Abstract Antimicrobial hydroxyapatite powders containing hydroxyapatite powder and metal ions selected from silver, copper and zinc ions or one or more antimicrobial agents selected from hinokitiol, tannin, lysozyme, protamine and sorbic acid.
Inventors
- 👤 Shuji Sakuma
- 👤 Kiminori Atsumi
- 👤 Keijiro Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:51
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/64; A01; A01N; A01N25/00; A01N25/12; A01N59/00; A01N59/26; A61K33/00; A61K33/24; A61K33/30; A61K33/34; A61K33/42; A61K6/00; A61K6/50; A61K6/58; A61K6/60; A61K6/69; A61K6/80; A61K6/831; A61K6/838; A61K8/19; A61K8/24; A61K8/33; A61K8/35; A61K8/36; A61K8/60; A61K8/602; A61K8/66; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/50; A61L27/54; A61Q; A61Q11/00; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61K2800/00; A61K2800/40; A61K2800/56; A61L2300/00; A61L2300/20; A61L2300/21; A61L2300/252; A61L2300/30; A61L2300/40; A61L2300/404
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
An antimicrobial hydroxyapatite powder comprising hydroxyapatite powder having absorbed therein silver ions.
Claim 2
Dependent Claim
12 words
An antimicrobial hydroxyapatite powder comprising hydroxyapatite powder having absorbed therein silver ions.
Claim 3
Dependent Claim
21 words
The antimicrobial hydroxyapatite powder of claim 1, wherein the powder contains from 0.0001 to 5% by weight of the silver ions.
Claim 4
Dependent Claim
25 words
The antimicrobial hydroxyapatite powder of claim 1 which also contains at least one metal ion selected from the group consisting of copper and zinc ions.
Claim 5
Dependent Claim
55 words
A method for preparing the antimicrobial hydroxyapatite powder of claim 1, comprising adding a calcium chloride solution to a solution containing disodium monohydrogen phosphate and at least one silver salt to form a precipitate of hydroxyapatite containing silver ions, collecting and washing the precipitate, and thereafter drying and crushing the precipitate to form said powder.
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |