Patent US2658933A successfully refreshed from Google Patents.
US2658933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry polymerization process
Assignee: Standard Oil Development Co
•
Filing: 1951-08-17
•
Granted: 1953-11-10
•
Expires: 1971-08-17
Abstract
No abstract record available.
Inventors
- 👤 Walter G May
- 👤 George L Matheson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:00
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN THE PROCESS OF POLYMERIZING OLEFINS TO PRODUCE LOW BOILING POLYMERS IN WHICH A SOLID, FINELY DIVIDED PHOSPHORIC ACID CATALYST IS MAINTAINED AS AN AGITATED SUSPENSION IN A FLUID HYDROCARBON PHASE COMPRISING SAID OLEFINS AND IN WHICH AT LEAST A PORTION OF SAID CATALYST AGGLOMERATES BY THE BINDING ACTION OF HIGH MOLECULAR WEIGHT MATERIALS ADSORBED THEREON, THE IMPROVEMENT WHICH COMPRISES REMOVING SAID AGGLOMERATED CATALYST FROM SAID SUSPENSION WASHING IT WITH A LIQUID SOLVENT WHEREBY IT IS DEGLOMERATED AND RETURNING THE DEGLOMERATED CATALYST TO SAID SUSPENSION, SAID SOLVENT HAVING GOOD SOLVENT PROPERTIES FOR SAID HIGH MOLECULAR WEIGHT BINDING MATERIALS.
Claim 2
Dependent Claim
98 words
IN THE PROCESS OF POLYMERIZING OLEFINS TO PRODUCE LOW BOILING POLYMERS IN WHICH A SOLID, FINELY DIVIDED PHOSPHORIC ACID CATALYST IS MAINTAINED AS AN AGITATED SUSPENSION IN A FLUID HYDROCARBON PHASE COMPRISING SAID OLEFINS AND IN WHICH AT LEAST A PORTION OF SAID CATALYST AGGLOMERATES BY THE BINDING ACTION OF HIGH MOLECULAR WEIGHT MATERIALS ADSORBED THEREON, THE IMPROVEMENT WHICH COMPRISES REMOVING SAID AGGLOMERATED CATALYST FROM SAID SUSPENSION WASHING IT WITH A LIQUID SOLVENT WHEREBY IT IS DEGLOMERATED AND RETURNING THE DEGLOMERATED CATALYST TO SAID SUSPENSION, SAID SOLVENT HAVING GOOD SOLVENT PROPERTIES FOR SAID HIGH MOLECULAR WEIGHT BINDING MATERIALS.
References Cited (Backward Citations)
US2234177A
Cited
US2515062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |