US4911898A
Expired / Lapsed
US
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Zeolite particles retaining silver ions having antibacterial properties
Assignee: Kanebo Gohsen Ltd
•
Filing: 1988-12-28
•
Granted: 1990-03-27
•
Expires: 2008-12-28
Abstract
Abstract Zeolite particles retaining silver ions having bacteriostatic properties on their ion-exchangeable sites in an amount up to 41% of the zeolite's exchange capacity are described.
Inventors
- 👤 Zenji Hagiwara
- 👤 Shigetaka Hoshino
- 👤 Hiroo Ishino
- 👤 Saburo Nohara
- 👤 Kenichi Tagawa
- 👤 Keio Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:31
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; A; A01; A01N; A01N25/00; A01N25/34; A01N59/00; A01N59/16; A01N59/20; A46; A46D; A46D1/00; A46D1/02; A46D1/023; Y; Y10; Y10S; Y10S264/00; Y10S264/25; Y10S423/00; Y10S423/21; Y10S423/24; Y10S423/25; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A bacteriocidal zeolite particle retaining silver metal ions having bacteriocidal properties at ion-exchangeable sites of the zeolite in an amount up to 41% of the ion exchange capacity of the zeolite, the zeolite having a specific surface area of at least 150 m 2 /g, based upon anhydrous zeolite as the standard, and an SiO 2 /Al 2 O 3 mol ratio of at most 14.
Claim 2
Dependent Claim
66 words
A bacteriocidal zeolite particle retaining silver metal ions having bacteriocidal properties at ion-exchangeable sites of the zeolite in an amount up to 41% of the ion exchange capacity of the zeolite, the zeolite having a specific surface area of at least 150 m 2 /g, based upon anhydrous zeolite as the standard, and an SiO 2 /Al 2 O 3 mol ratio of at most 14.
Claim 3
Dependent Claim
34 words
The zeolite particle as claimed in claim 1, in which the zeolite particle is composed of a material selected from the group consisting of A zeolite, X zeolite, Y zeolite, mordenite and mixtures thereof.
Claim 4
Dependent Claim
116 words
A process of preparing a bacteriocidal zeolite particle having a specific surface area of at least 150 m 2 /g, based upon anhydrous zeolite as the standard, and an SiO 2 /Al 2 O 3 mol ratio of at most 14, the process comprising contacting the particle with a solution of a water soluble silver salt the silver ion of which has bacteriocidal properties thereby exchanging with the silver ion from the solution, provided that a concentration of the silver salt in the solution is sufficiently low to prevent deposition of silver compounds onto the zeolite and wherein the contacting is repeated until up to 41% of the ion exchange capacity of the zeolite is reached.
Claim 5
Dependent Claim
116 words
A process of preparing a bacteriocidal zeolite particle having a specific surface area of at least 150 m 2 /g, based upon anhydrous zeolite as the standard, and an SiO 2 /Al 2 O 3 mol ratio of at most 14, the process comprising contacting the particle with a solution of a water soluble silver salt the silver ion of which has bacteriocidal properties thereby exchanging with the silver ion from the solution, provided that a concentration of the silver salt in the solution is sufficiently low to prevent deposition of silver compounds onto the zeolite and wherein the contacting is repeated until up to 41% of the ion exchange capacity of the zeolite is reached.
Claim 6
Dependent Claim
33 words
The process as claimed in claim 3, in which the zeolite particle is composed of a material selected from the group consisting of A zeolite, X zeolite, Y zeolite, mordenite and mixtures thereof.
Claim 7
Dependent Claim
28 words
The process as claimed in claim 3, in which the solution is an aqueous solution of a silver salt of a molar concentration of at most 0.3 mol/1.
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |