US4749537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of formed members for the disinfection of water
Assignee: Medichem AG
•
Filing: 1986-03-25
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Granted: 1988-06-07
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Expires: 2006-03-25
Abstract
Abstract A process for the production of a prolonged release shaped product for the disinfection of water or aqueous solutions which comprises shaping, by deformation at a pressure of at least 8000 kg/cm 2 , at least one difficulty soluble metal compound having microbicidal activity into shaped form, and treating the compound in a manner which produces an outer metal oxide layer on the surface of the shaped product which is readily soluble in water wherein the readily soluble metal oxide layer of the shaped product provides an initial source of microbicidal activity, and the difficulty soluble metal compound provides a prolonged release source of microbicidal activity.
Inventors
- 👤 Kurt Gautschi
- 👤 Walter Sigrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:15
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; C02F1/505
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A process for the production of a prolonged release shaped product for the disinfection of water or aqueous solutions which comprises shapng, by deformation at a pressure of at least 8000 kg/cm 2 , at least one difficulty soluble metal compound having microbicidal activity into shaped form, and treating the shaped compound in a manner which produces an outer metal oxide layer on the surface of the shaped product, said oxide layer being readily soluble in water, wherein the readily soluble metal oxide layer of the shaped product provides an initial source of microbicidal activity, and the difficulty soluble metal compound provides a prolonged release source of microbicidal activity.
Claim 2
Dependent Claim
109 words
A process for the production of a prolonged release shaped product for the disinfection of water or aqueous solutions which comprises shapng, by deformation at a pressure of at least 8000 kg/cm 2 , at least one difficulty soluble metal compound having microbicidal activity into shaped form, and treating the shaped compound in a manner which produces an outer metal oxide layer on the surface of the shaped product, said oxide layer being readily soluble in water, wherein the readily soluble metal oxide layer of the shaped product provides an initial source of microbicidal activity, and the difficulty soluble metal compound provides a prolonged release source of microbicidal activity.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein the metal compound is treated by heating to a temperature sufficient to convert a portion of the tablet to an oxide form of the metal compound.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the metal compound is treated with acid.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the metal is selected from the group consisting of silver, tin, copper and quicksilver.
Claim 6
Dependent Claim
10 words
The process of claim 4 wherein the metal is silver.
Claim 7
Dependent Claim
15 words
The process of claim 5 wherein the metal compound is silver bromide or silver chloride.
Claim 8
Dependent Claim
29 words
The process of claim 1 wherein the readily soluble metal oxide is present in an amount of about 1 to about 10% of the amount of difficulty soluble metal.
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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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |