Patent US4463031A successfully refreshed from Google Patents.
US4463031A
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US
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Process for preparing a bacteriological inhibitor for water
Assignee: Individual
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Filing: 1982-09-29
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Granted: 1984-07-31
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Expires: 2002-09-29
Abstract
Abstract A process for preparing a silver-plated coral sand useful as a bacteriological inhibitor for drinking water is provided. The process comprises (1) heating desalted coral sand in an inert gas under reduced pressure; (2) thoroughly washing the resulting activated coral sand with water; (3) soaking the so washed coral sand in a silver-ammonia complex solution with heating under reduced pressure, adding a trace amount of glucose as a reducing agent to the complex solution, maintaining the soaked state to thereby effect plating the coral sand with silver; (4) evaporating the silver-plate coral sand to dryness with heating under reduced pressure; (5) thoroughly washing the silver-plated coral sand with water, and (6) then drying the silver-plated coral sand. The silver-plated coral sand bacteriological inhibitor has a strong sterilizing power against bacteria in water and can maintain or even improve water quality over long periods of time; at the same time, the bacteriological inhibitor can change pH to a weakly alkaline side and mineralize water.
Inventors
- 👤 Nobuo Someya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:31
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; C02F1/505; A; A01; A01N; A01N59/00; A01N59/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A process for preparing a bacteriological inhibitor comprising silver-plated coral sand which comprises heating desalted coral sand in an inert gas under reduced pressure to activate said coral sand; thoroughly washing said activated coral sand with water to provide activated coral sand substantially free of nitric acid radicals; soaking so washed coral sand in a nitric acid radical-free silver-ammonia complex solution with heating under reduced pressure, adding a trace amount of a reducing agent to said silver-ammonia complex solution, maintaining the soaked state of said coral sand for a time period required to thereby plate said coral sand with silver; evaporating said silver-plated coral sand to dryness with heating under reduced pressure; thoroughly washing said silver-plated coral sand with water, and then drying said silver-plated coral sand to provide a substantially nitric acid radical-free bacteriological inhibitor.
Claim 2
Dependent Claim
136 words
A process for preparing a bacteriological inhibitor comprising silver-plated coral sand which comprises heating desalted coral sand in an inert gas under reduced pressure to activate said coral sand; thoroughly washing said activated coral sand with water to provide activated coral sand substantially free of nitric acid radicals; soaking so washed coral sand in a nitric acid radical-free silver-ammonia complex solution with heating under reduced pressure, adding a trace amount of a reducing agent to said silver-ammonia complex solution, maintaining the soaked state of said coral sand for a time period required to thereby plate said coral sand with silver; evaporating said silver-plated coral sand to dryness with heating under reduced pressure; thoroughly washing said silver-plated coral sand with water, and then drying said silver-plated coral sand to provide a substantially nitric acid radical-free bacteriological inhibitor.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said heating in an inert gas is at temperatures ranging from about 200° to about 400° C. under reduced pressure of from -20 to -50 mmHg.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said thorough washing with water is performed for at least about 24 hours.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein said reducing agent is selected from the group consisting of a Rochelle salt, formaldehyde and glucose.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein said inert gas is selected from the group consisting of argon and nitrogen.
Claim 7
Dependent Claim
60 words
The process of claim 1 wherein said soaking is performed firstly under conditions at temperatures ranging from about 20° to 40° C. for about 1 hour under a reduced pressure ranging from -20 to -50 mmHg, and, after adding the reducing agent to the complex solution, maintaining the soaked state at ambient temperature for about 10 to about 20 hours.
Claim 8
Dependent Claim
35 words
The process of claim 1 wherein said heating for evaporating to dryness is performed at temperatures ranging from about 200° to 400° C. under a reduced pressure of from about -20 to about -50 mmHg.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein said drying is performed at temperatures ranging from about 50° to about 80° C. for about 4 hours.
Claim 10
Dependent Claim
32 words
The process of claim 1 wherein said silver is plated on the coral sand in an amount of 1 to 15 wt% based on the total weight of said silver-plated coral sand.
References Cited (Backward Citations)
US3242073A
Cited
US4407865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |