Patent US5392775A successfully refreshed from Google Patents.
US2647868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color removal from esters
Assignee: Imperial Chemical Industries Ltd
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Filing: 1950-12-28
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Granted: 1953-08-04
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Expires: 1970-12-28
Abstract
No abstract record available.
Inventors
- 👤 Dean Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:43
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/025; C07F9/06; C07F9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR REMOVING UNDESIRED COLOURATION FROM ESTERS SELECTED FROM THE GROUP CONSISTING OF THE PHTHALATES, ORTHO-PHOSPHATES AND GLUTARATES OF ALCOHOLS HAVING AT LEAST SIX CARBON ATOMS AND NOT MORE THAN NINE CARBON ATOMS IN THE MOLECULE, SAID ALCOHOLS HAVING BEEN PREPARED BY CARBONYLATING OLEFINES WITH CARBON MONOXIDE AND HYDROGEN UNDER ELEVATED TEMPERATURE AND PRESSURE IN THE PRESENCE OF A COBALT CATALYST AND HYDROGENATING THE CARBONYLATION PRODUCT, SAID ESTERS DISPLAYING IN A SIX-INCH CELL OF A STANDARD LOVIBOND COLORIMETER UP TO THREE UNITS IN THE RED, TOGETHER WITH UP TO TEN UNITS IN THE YELLOW, WHICH COMPRISES EXPOSING SAID ESTERS AS A THIN LAYER HAVING A THICKNESS NOT IN EXCESS OF FIVE MILLIMETERS TO TRANSVERSE LIGHT CONTAINING A SUBSTANTIAL PROPORTION OF A WAVE LENGTH APPROXIMATELY EQUAL TO 3650A.
Claim 2
Dependent Claim
128 words
A PROCESS FOR REMOVING UNDESIRED COLOURATION FROM ESTERS SELECTED FROM THE GROUP CONSISTING OF THE PHTHALATES, ORTHO-PHOSPHATES AND GLUTARATES OF ALCOHOLS HAVING AT LEAST SIX CARBON ATOMS AND NOT MORE THAN NINE CARBON ATOMS IN THE MOLECULE, SAID ALCOHOLS HAVING BEEN PREPARED BY CARBONYLATING OLEFINES WITH CARBON MONOXIDE AND HYDROGEN UNDER ELEVATED TEMPERATURE AND PRESSURE IN THE PRESENCE OF A COBALT CATALYST AND HYDROGENATING THE CARBONYLATION PRODUCT, SAID ESTERS DISPLAYING IN A SIX-INCH CELL OF A STANDARD LOVIBOND COLORIMETER UP TO THREE UNITS IN THE RED, TOGETHER WITH UP TO TEN UNITS IN THE YELLOW, WHICH COMPRISES EXPOSING SAID ESTERS AS A THIN LAYER HAVING A THICKNESS NOT IN EXCESS OF FIVE MILLIMETERS TO TRANSVERSE LIGHT CONTAINING A SUBSTANTIAL PROPORTION OF A WAVE LENGTH APPROXIMATELY EQUAL TO 3650A.
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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |