Patent US4020091A successfully refreshed from Google Patents.
US4020091A
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Chelation
Assignee: Plains Chemical Development Co
•
Filing: 1970-04-30
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Granted: 1977-04-26
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Expires: 1990-04-30
Abstract
Abstract Tin salts of polyphosphonic acids, e.g., stannous salts of ethane hydroxy diphosphonic acid and methane phenyl hydroxy diphosphonic acid are prepared.
Inventors
- 👤 Edward G. Budnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:28
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
Tin salts of polyphosphonic acids having a formula selected from the group consisting of ##STR2## where X is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, chloroalkyl, chloroaryl and halogen of atomic weight 35 to 80, Y is selected from the group consisting of hydroxyl, phenyl and halogen of atomic weight 35 to 80 and Z is selected from the group consisting of hydrogen, phenyl and halogen of atomic weight 35 to 80.
Claim 2
Dependent Claim
75 words
Tin salts of polyphosphonic acids having a formula selected from the group consisting of ##STR2## where X is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, chloroalkyl, chloroaryl and halogen of atomic weight 35 to 80, Y is selected from the group consisting of hydroxyl, phenyl and halogen of atomic weight 35 to 80 and Z is selected from the group consisting of hydrogen, phenyl and halogen of atomic weight 35 to 80.
Claim 3
Dependent Claim
12 words
Tin salts according to claim 1 wherein the tin is stannous tin.
Claim 4
Dependent Claim
12 words
Tin salts according to claim 1 wherein the tin is stannic tin.
Claim 5
Dependent Claim
49 words
Stannous salts of polyphosphonic acids having the formula ##STR3## wherein R 3 is a member selected from the group consisting of hydrogen, chlorine, bromine, alkyl or alkenyl of 2 to 17 carbon atoms, and R 4 is a member selected from the group consisting of chlorine, bromine and hydroxyl.
Claim 6
Dependent Claim
49 words
Stannous salts of polyphosphonic acids having the formula ##STR3## wherein R 3 is a member selected from the group consisting of hydrogen, chlorine, bromine, alkyl or alkenyl of 2 to 17 carbon atoms, and R 4 is a member selected from the group consisting of chlorine, bromine and hydroxyl.
Claim 7
Dependent Claim
2 words
Distannous ethane-1-hydroxy-1,1-diphosphonate.
Claim 8
Dependent Claim
2 words
Distannous ethane-1-hydroxy-1,1-diphosphonate.
Claim 9
Dependent Claim
2 words
Distannous methanephenylhydroxydiphosphonate.
Claim 10
Dependent Claim
2 words
Distannous methanephenylhydroxydiphosphonate.
References Cited (Backward Citations)
US2848475A
Cited
US3122417A
Cited
US3149151A
Cited
US3159581A
Cited
US3299123A
Cited
US3388179A
Cited
US3422137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |