US2778849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of plasticizer esters
Assignee: WILLIAM M HACKMAN
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Filing: 1953-09-25
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Granted: 1957-01-22
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Expires: 1973-09-25
Abstract
No abstract record available.
Inventors
- 👤 Ackelsberg Oscar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:12
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/52; C07C67/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE PROCESS OF DEODORIZING AND PURIFYING DI-ALKYL ESTERS OF ORGANIC DICARBOXYLIC ACIDS HAVING UP TO AND INCLUDING TWELVE CARBON ATOMS IN THE ALKYL GROUP, AND TO A PURITY BETWEEN ABOUT NINETY-NONE AND ONE HUNDRED PERCENT, WHICH ESTERS ARE LIQUID AND STABLE AT A TEMPERATURE BETWEEN ABOUT ONE HUNDRED AND ABOUT ONE HUNDRED AND SIXTY DEGREES, WHICH METHOD COMPRISES MAINTAINING SUCH ESTER AT A TEMPERATURE FROM ABOUT ONE HUNDRED DEGREES TO ANY HIGHER TEMPERATURE BELOW THAT AT WHICH THE ESTER IS ADVERSELY AFFECTED, WHILE SUNJECTING SUCH ESTER TO SUBATMOSPHERIC PRESSURE WITHIN THE RANGE OF ABOUT ONE HUNDRED MILLIMETERS OF MERCURY AND LESS AND SIMULTANEOUSLY INJECTING LIVE STEAM INTO THE BODY OF LIQUID ESTER AND IN A QUALTITY AND FOR A TIME SUFFICIENT FOR IT TO REACH THE DESIRED PURITY WITHIN THE ABOVE RECITED RANG
Claim 2
Dependent Claim
133 words
THE PROCESS OF DEODORIZING AND PURIFYING DI-ALKYL ESTERS OF ORGANIC DICARBOXYLIC ACIDS HAVING UP TO AND INCLUDING TWELVE CARBON ATOMS IN THE ALKYL GROUP, AND TO A PURITY BETWEEN ABOUT NINETY-NONE AND ONE HUNDRED PERCENT, WHICH ESTERS ARE LIQUID AND STABLE AT A TEMPERATURE BETWEEN ABOUT ONE HUNDRED AND ABOUT ONE HUNDRED AND SIXTY DEGREES, WHICH METHOD COMPRISES MAINTAINING SUCH ESTER AT A TEMPERATURE FROM ABOUT ONE HUNDRED DEGREES TO ANY HIGHER TEMPERATURE BELOW THAT AT WHICH THE ESTER IS ADVERSELY AFFECTED, WHILE SUNJECTING SUCH ESTER TO SUBATMOSPHERIC PRESSURE WITHIN THE RANGE OF ABOUT ONE HUNDRED MILLIMETERS OF MERCURY AND LESS AND SIMULTANEOUSLY INJECTING LIVE STEAM INTO THE BODY OF LIQUID ESTER AND IN A QUALTITY AND FOR A TIME SUFFICIENT FOR IT TO REACH THE DESIRED PURITY WITHIN THE ABOVE RECITED RANG
References Cited (Backward Citations)
US1993737A
Cited
US1993738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |