US3867286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of polyquaternary ammonium methylene phosphonates to chelate or inhibit formation of scale
Assignee: Baker Petrolite LLC
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Filing: 1973-10-29
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Granted: 1975-02-18
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Expires: 1993-10-29
Abstract
Abstract Polyquaternary ammonium methylene phosphonates and uses thereof, particularly as scale inhibitors, chelating agents, bactericides, etc.
Inventors
- 👤 Patrick M Quinlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:37
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817; A; A01; A01N; A01N57/00; A01N57/18; C02; C02F; C02F1/00; C02F1/50; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
THE PROCESS OF CHELATING OR INHIBITING THE FORMATION OF SCALE IN AN AQUEOUS SYSTEM WHICH TENDS TO FORM SCALE WHICH COMPRISES ADDING TO SAID SYSTEM A POLYQUATERNARY COMPOUND HAVING REPEATING UNITS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
35 words
THE PROCESS OF CHELATING OR INHIBITING THE FORMATION OF SCALE IN AN AQUEOUS SYSTEM WHICH TENDS TO FORM SCALE WHICH COMPRISES ADDING TO SAID SYSTEM A POLYQUATERNARY COMPOUND HAVING REPEATING UNITS OF THE GENERAL FORMULA
Claim 3
Dependent Claim
12 words
The process of claim 1 where the polyquaternary has the general formula
Claim 4
Dependent Claim
11 words
The process of claim 2 where the polyquaternary has the formula
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |