Patent US4041110A successfully refreshed from Google Patents.
US4041110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monophosphoric acid esters of hydroxy alkyl urea compounds
Assignee: Joh A Benckiser GmbH
•
Filing: 1975-11-07
•
Granted: 1977-08-09
•
Expires: 1995-11-07
Abstract
Abstract Scale formation as well as deposition of incrustations in aqueous systems are prevented by the addition of a monophosphoric acid ester of a hydroxy alkyl urea compound or of salts of such an ester. Preferred esters of this type are the esters obtained by reacting hydroxyl alkyl urea compounds with urea phosphate. The esters are highly effective even when they are added in substoichiometric amounts calculated with respect to the scale and hardness causing compounds present in aqueous systems.
Inventors
- 👤 Friedrich Krueger
- 👤 Guenter Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:16
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A phosphoric acid ester of a hydroxy alkyl urea compound of the formula ##STR13## in which X is a member selected from the group consisting of lower alkyl with 2 to 6 carbon atoms and lower alkoxy lower alkyl with 2 to 6 carbon atoms, while Y is a member selected from the group consisting of hydrogen and the --X--O--PO 3 H 2 group or the water soluble salts thereof.
Claim 2
Dependent Claim
70 words
A phosphoric acid ester of a hydroxy alkyl urea compound of the formula ##STR13## in which X is a member selected from the group consisting of lower alkyl with 2 to 6 carbon atoms and lower alkoxy lower alkyl with 2 to 6 carbon atoms, while Y is a member selected from the group consisting of hydrogen and the --X--O--PO 3 H 2 group or the water soluble salts thereof.
Claim 3
Dependent Claim
19 words
The phosphoric acid ester of claim 1, said ester being the phosphoric acid ester of 2-(2-hydroxy ethoxy) ethyl urea.
Claim 4
Dependent Claim
18 words
The phosphoric acid ester of claim 1, said ester being the phosphoric acid ester of 1-hydroxy-2-methyl isopropyl urea.
Claim 5
Dependent Claim
18 words
The phosphoric acid ester of claim 1, said ester being the phosphoric acid ester of 3-hydroxy propyl urea.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |