US3621081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oligomeric ester chain condensates of ethane-1-hydroxy-1,1-diphosphonic acid
Assignee: Procter and Gamble Co
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Filing: 1968-12-23
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Granted: 1971-11-16
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Expires: 1988-12-23
Abstract
Abstract Organo-phosphorus compounds which are oligomeric ester chain condensates of ethane-1-hydroxy-1,1-diphosphonic acid having the following formula: WHEREIN M is a water-soluble cation; R is hydrogen or acetyl and n has a numerical value in the range of 1 to about 16. The compounds are useful as sequestering agents and builders in detergent compositions.
Inventors
- 👤 James B Prentice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:16
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/36; C11D3/361; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C07F9/386; C07F9/40; C07F9/4071; C07F9/4075
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
21 words
A compound according to claim 2 in which n has a numerical value in the range of 2 to about 12.
References Cited (Backward Citations)
US3363031A
Cited
US3354166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |