Patent US2843639A successfully refreshed from Google Patents.
US2843639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for securing and maintaining catalyst activity of phosphoric acid type catalysts
Assignee: California Research LLC
•
Filing: 1954-02-15
•
Granted: 1958-07-15
•
Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Gordon E Langlois
- 👤 Willard M Haunschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:34
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/28; B01J27/285; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2/54; C07C7/00; C07C7/005; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
PROCESS OF SECURISNG AND MAINTAINING A HIGH LEVEL OF CASTALYST ACTIVITY OF PHOSPHORIC ACID TYPE CATALYST EMPLOYED IN THE CONVERSION OF PROPYLENE IN A HYDROCARBON FEED, INCLUDING POLYMERIZATION AND ALKYLATION, SAID HYDROCARBON FEED CONTAINING BASIC AND ACIDIC CATALYST-POISONING POLAR MATERIALS, AND, IN ADDITION, HYDROCARBON-SOLUBLE NEUTRAL CATALYST-POISONING POLAR MATERIALS HAVING BOILING POINTS HIGHER THAN C3 AND C4 HYDROCARBONS AND UNREACTIVE WITH AQUEOUS CAUSTIC AND AQUEOUS ACID SOLUTIONS, WHICH COMPRISES TREATING THE HYDROCARBON FEED, PRIOR TO CONVERSION, WITH A BASIC REAGENT TO REMOVE ACIDIC POLAR MATERIALS, WASHING THE RESULTING HYDROCARBON FEED WITH WATER HAVING A PH NOT EXCEEDING ABOUT 8 TO REMOVE BASIC POLAR COMPOUNDS, AND TREATING THE WASHED HYDROCARBON FEED TO REMOVE THE NEUTRAL POLAR MATERIALS.
Claim 2
Dependent Claim
115 words
PROCESS OF SECURISNG AND MAINTAINING A HIGH LEVEL OF CASTALYST ACTIVITY OF PHOSPHORIC ACID TYPE CATALYST EMPLOYED IN THE CONVERSION OF PROPYLENE IN A HYDROCARBON FEED, INCLUDING POLYMERIZATION AND ALKYLATION, SAID HYDROCARBON FEED CONTAINING BASIC AND ACIDIC CATALYST-POISONING POLAR MATERIALS, AND, IN ADDITION, HYDROCARBON-SOLUBLE NEUTRAL CATALYST-POISONING POLAR MATERIALS HAVING BOILING POINTS HIGHER THAN C3 AND C4 HYDROCARBONS AND UNREACTIVE WITH AQUEOUS CAUSTIC AND AQUEOUS ACID SOLUTIONS, WHICH COMPRISES TREATING THE HYDROCARBON FEED, PRIOR TO CONVERSION, WITH A BASIC REAGENT TO REMOVE ACIDIC POLAR MATERIALS, WASHING THE RESULTING HYDROCARBON FEED WITH WATER HAVING A PH NOT EXCEEDING ABOUT 8 TO REMOVE BASIC POLAR COMPOUNDS, AND TREATING THE WASHED HYDROCARBON FEED TO REMOVE THE NEUTRAL POLAR MATERIALS.
References Cited (Backward Citations)
US2263043A
Cited
US2348017A
Cited
US2579433A
Cited
US2599743A
Cited
US2694686A
Cited
US2698351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |