Patent US3941696A successfully refreshed from Google Patents.
US3941696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterilization of holding tanks and toilet bowls by quaternary compounds
Assignee: Baylor College of Medicine
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Filing: 1975-03-24
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Granted: 1976-03-02
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Expires: 1995-03-24
Abstract
Abstract Wastewaters heavily laden with organic compounds and containing viruses and other microbiological flora are sterilized and maintained sterile for prolonged periods of time by the addition of a base, such as lime, and a quaternary compound, preferably cetyl pyridinium chloride, in amounts to maintain the pH of the wastewaters at about 9-11, or higher, and with sufficient quaternary compound for suspended solids present. This prevents the formation of methane gases, which are tentative hazards in that they are inflammable, asphyxiant and narcotic. Similarly, toilets are rendered sterile by the addition of the base and quaternary compound so that, upon flushing, aerosols generated will not contain active infectious agents. All bacteria and fungi are inactivated under these basic conditions by the addition of quaternary compounds. Viruses are also inactivated under these basic conditions but only with quaternary compounds which contain the pyridinium moiety. The disclosure includes products for and methods of sterilizing wastewaters. A number of examples are given.
Inventors
- 👤 Joseph L. Melnick
- 👤 Craig Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:29
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; A; A01; A01N; A01N33/00; A01N33/02; A01N33/12; A01N43/00; A01N43/34; A01N43/40; A61; A61L; A61L9/00; A61L9/01
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
89 words
A method of sterilizing wastewater in tanks and the like, the wastewater having an organic load containing bacteria not inactivated by basicity alone and viruses comprising, adding 10 to 400 ppm liquid quaternary compound containing a pyridinium moiety to the wastewater for 1000 ppm suspended solids in the wastewater, and adding a liquid base to the wastewater to interact with said quaternary compound to cause said quaternary compound to inactivate said bacteria and viruses and in an amount sufficient to bring the wastewater to a pH of about 10.5.
Claim 2
Independent Claim
89 words
A method of sterilizing wastewater in tanks and the like, the wastewater having an organic load containing bacteria not inactivated by basicity alone and viruses comprising, adding 10 to 400 ppm liquid quaternary compound containing a pyridinium moiety to the wastewater for 1000 ppm suspended solids in the wastewater, and adding a liquid base to the wastewater to interact with said quaternary compound to cause said quaternary compound to inactivate said bacteria and viruses and in an amount sufficient to bring the wastewater to a pH of about 10.5.
Claim 3
Dependent Claim
11 words
The method of claim 1 where the quaternary compound is CPC
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein the base is lime.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein the base and the quaternary compound are added simultaneously as a unitary liquid.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
Claim 7
Dependent Claim
16 words
The method of claim 4 wherein 50 to 100 ppm CPC is added to the wastewater.
Claim 8
Dependent Claim
17 words
The method of claim 3 wherein 10 to 100 ppm quaternay compound is added to the wastewater.
Claim 9
Dependent Claim
16 words
The method of claim 3 wherein 50 to 100 ppm CPC is added to the wastewater.
Claim 10
Dependent Claim
19 words
The method of claim 2 wherein the base and the quaternary compound are added simultaneously as a unitary liquid.
Claim 11
Dependent Claim
17 words
The method of claim 9 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
Claim 12
Dependent Claim
16 words
The method of claim 9 wherein 50 to 100 ppm CPC is added to the wastewater.
Claim 13
Dependent Claim
17 words
The method of claim 2 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
Claim 14
Dependent Claim
16 words
The method of claim 2 wherein 50 to 100 ppm CPC is added to the wastewater.
Claim 15
Dependent Claim
10 words
The method of claim 1 where the base is lime.
Claim 16
Dependent Claim
19 words
The method of claim 14 wherein the base and the quaternary compound are added simultaneously as a unitary liquid.
Claim 17
Dependent Claim
17 words
The method of claim 15 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
Claim 18
Dependent Claim
17 words
The method of claim 14 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
Claim 19
Dependent Claim
19 words
The method of claim 1 wherein the base and the quaternary compound are added simultaneously as a unitary liquid.
Claim 20
Dependent Claim
17 words
The method of claim 18 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
Claim 21
Dependent Claim
17 words
The method of claim 1 wherein 10 to 100 ppm quaternary compound is added to the wastewater.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |