Patent US3400176A successfully refreshed from Google Patents.
US3400176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propanepolyphosphonate compounds
Assignee: Procter and Gamble Co
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Filing: 1965-11-15
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Granted: 1968-09-03
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Expires: 1985-11-15
Abstract
No abstract record available.
Inventors
- 👤 Oscar T Quimby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:27
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
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PROPANE - 1,1,2,3 - TETRAPHOSPHONIC ACID, PROPANE-1,2,2,3TETRAPHOSPHONIC ACID, PROPANE-1,1,3,3-TETRAPHOSPHONIC ACID, WATER SOLUBLE SALTS THEREOF AND LOWER ALKYL ESTERS THEREOF.
Claim 2
Dependent Claim
27 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PROPANE - 1,1,2,3 - TETRAPHOSPHONIC ACID, PROPANE-1,2,2,3TETRAPHOSPHONIC ACID, PROPANE-1,1,3,3-TETRAPHOSPHONIC ACID, WATER SOLUBLE SALTS THEREOF AND LOWER ALKYL ESTERS THEREOF.
Claim 3
Dependent Claim
89 words
A PROCESS FOR PREPARING AN ESTER OF PROPANE-1,1,3,3TETRAPHOSPHONIC ACID WHICH COMPRISES REACTING AN ALKALI METAL CARBANION OF A TETRALOWERALKYL METHYLENEDIPHOSPHONATE WITH DIHALOMETHANE IN THE PRESENCE OF AN ORGANIC SOLVENT HAVING NO ACTIVE HYDROGEN ATOMS SELECTED FROM THE GROUP CONSISTING OF TOLUENE AND BENZENE WHEREIN SAID CARBANION AND SAID DIHALOMETHANE ARE EMPLOYED RESPECTIVELY IN A MOLAR RATIO OF FROM ABOUT 1:0.55 TO ABOUT 1:10 AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 30*C. TO ABOUT 125*C. FOR A TIME PERIOD OF FROM ABOUT 10 HOURS TO ABOUT 100 HOURS.
Claim 4
Dependent Claim
89 words
A PROCESS FOR PREPARING AN ESTER OF PROPANE-1,1,3,3TETRAPHOSPHONIC ACID WHICH COMPRISES REACTING AN ALKALI METAL CARBANION OF A TETRALOWERALKYL METHYLENEDIPHOSPHONATE WITH DIHALOMETHANE IN THE PRESENCE OF AN ORGANIC SOLVENT HAVING NO ACTIVE HYDROGEN ATOMS SELECTED FROM THE GROUP CONSISTING OF TOLUENE AND BENZENE WHEREIN SAID CARBANION AND SAID DIHALOMETHANE ARE EMPLOYED RESPECTIVELY IN A MOLAR RATIO OF FROM ABOUT 1:0.55 TO ABOUT 1:10 AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 30*C. TO ABOUT 125*C. FOR A TIME PERIOD OF FROM ABOUT 10 HOURS TO ABOUT 100 HOURS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |