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US4911899A
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Zeolite particles having bacteriocidal properties
Assignee: Kanebo Gohsen Ltd
•
Filing: 1988-12-28
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Granted: 1990-03-27
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Expires: 2008-12-28
Abstract
Abstract Zeolite particles retaining at least one metal ion having bacteriostatic properties on their ion-exchangeable sites in an amount up to 41% of the zeolite's ion 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
2026-11-09 17:32
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: 11
Claim 1
Independent Claim
67 words
A bacteriocidal zeolite particle retaining at least one metal ion 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 most 14.
Claim 2
Dependent Claim
67 words
A bacteriocidal zeolite particle retaining at least one metal ion 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 most 14.
Claim 3
Dependent Claim
31 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, Z-zeolite, Y-zeolite, mordenite and mixtures thereof.
Claim 4
Dependent Claim
25 words
The zeolite particle as claimed in claim 1, in which the metal ion is selected from the group consisting of silver, copper and zinc ions.
Claim 5
Dependent Claim
115 words
The 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 metal salt the metal ion of which has bacteriocidal properties thereby exchanging with the metal ion from the solution, provided that a concentration of the metal salt in the solution is sufficiently low to prevent deposition of metal compounds into 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
115 words
The 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 metal salt the metal ion of which has bacteriocidal properties thereby exchanging with the metal ion from the solution, provided that a concentration of the metal salt in the solution is sufficiently low to prevent deposition of metal compounds into the zeolite and wherein the contacting is repeated until up to 41% of the ion exchange capacity of the zeolite is reached.
Claim 7
Dependent Claim
32 words
The process as claimed in claim 4, in which the zeolite particle is composed of a material selected from the group of A zeolite, X zeolite, Y zeolite, mordenite and mixtures thereof.
Claim 8
Dependent Claim
24 words
The process as claimed in claim 4, in which the metal ion is selected from the group consisting of silver, copper and zinc ions.
Claim 9
Dependent Claim
28 words
The process as claimed in claim 4, in which the solution is an aqueous solution of a silver salt of a molar concentration of at most 0.3 mol/l.
Claim 10
Dependent Claim
28 words
The process as claimed in claim 4, in which the solution is an aqueous solution of a copper salt of a molar concentration of at most 0.05 mol/l.
Claim 11
Dependent Claim
28 words
The process as claimed in claim 4, in which the solution is an aqueous solution of a zinc salt of a molar concentration of at most 3 mol/l.
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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 |