US4111679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyquaternary compounds for the control of microbiological growth
Assignee: Chemed Corp
•
Filing: 1977-08-17
•
Granted: 1978-09-05
•
Expires: 1997-08-17
Abstract
Abstract Control of microorganisms in industrial recirculating water systems using polyquaternary amines.
Inventors
- 👤 Salem A. Shair
- 👤 Stewart N. Paul
- 👤 James E. Cairns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:01
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; A; A01; A01N; A01N33/00; A01N33/02; A01N33/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
The method for controlling microorganisms in industrial cooling water systems which comprises adding to the system a microbiocidal amount of a polyquaternary amine of the formula ##STR3## where R 1 and R 2 are methyl or ethyl, X is Cl, Br, or I, and n is 3 to 10,000.
Claim 2
Independent Claim
49 words
The method for controlling microorganisms in industrial cooling water systems which comprises adding to the system a microbiocidal amount of a polyquaternary amine of the formula ##STR3## where R 1 and R 2 are methyl or ethyl, X is Cl, Br, or I, and n is 3 to 10,000.
Claim 3
Dependent Claim
23 words
The method according to claim 1 in which R 1 and R 2 are methyl, X is Cl, and n is about 500.
Claim 4
Dependent Claim
16 words
The method according to claim 2 in which the effective amount is 0.05 to 1000 ppm.
References Cited (Backward Citations)
US3299138A
Cited
US3771989A
Cited
US3738945A
Cited
US3943255A
Cited
US4054542A
Cited
US4018592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |