Patent DE236589C successfully refreshed from Google Patents.
Patent US4012440A successfully refreshed from Google Patents.
US4012440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methylene phosphonates of oxyalkylated polyalkylene polyamines and uses therefor
Assignee: Baker Petrolite LLC
•
Filing: 1974-03-27
•
Granted: 1977-03-15
•
Expires: 1994-03-27
Abstract
Abstract Methylene phosphonates of oxyalkylated polyalkylene polyamines having at least three nitrogen atoms wherein there are nitrogen-bonded methylene phosphonate units of the formula --CH 2 PO(OM) 2 . These compounds are used as scale inhibitors, chelating agents, etc.
Inventors
- 👤 Patrick M. Quinlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:11
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817; C23F14/00; C23F14/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
Methylene phosphonates of oxyethylated polyalkylene polyamines having at least three nitrogen atoms, said methylene phosphonates having nitrogen-bonded methylene phosphonate units of the formula --CH 2 PO(OM) 2 , M being alkali metal, alkaline earth metal, hydrogen, alkyl ammonium or ammonium, wherein at least 50% of the nitrogen-bonded hydrogens of the polyamine are replaced with the methylene phosphonate units and the remainder of the nitrogen-bonded hydrogens are oxyethylated.
Claim 2
Dependent Claim
67 words
Methylene phosphonates of oxyethylated polyalkylene polyamines having at least three nitrogen atoms, said methylene phosphonates having nitrogen-bonded methylene phosphonate units of the formula --CH 2 PO(OM) 2 , M being alkali metal, alkaline earth metal, hydrogen, alkyl ammonium or ammonium, wherein at least 50% of the nitrogen-bonded hydrogens of the polyamine are replaced with the methylene phosphonate units and the remainder of the nitrogen-bonded hydrogens are oxyethylated.
Claim 3
Dependent Claim
40 words
The methylene phosphonates of oxyethylated polyalkylene polyamines of claim 1 having the formula where the Rs are --A'--OH or --CH 2 PO(OM) 2 , A is ##STR16##m is 2-10, n is 2-25, and A'--oh is Et--OH and Et is ethylene.
Claim 4
Dependent Claim
18 words
The methylene phosphonates of oxyalkylated polyalkylene polyamines of claim 2 where A is --CH 2 CH 2 --.
Claim 5
Dependent Claim
14 words
The methylene phosphonates of oxyalkylated polyalkylene polyamines of claim 3 where M is hydrogen.
Claim 6
Dependent Claim
14 words
The methylene phosphonates of oxyalkylated polyalkylene polyamines of claim 3 where M is sodium.
References Cited (Backward Citations)
US2599807A
Cited
US2673213A
Cited
US2917528A
Cited
US2964549A
Cited
US3288846A
Cited
US3799893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |