US2856393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
G goering
Assignee: —
•
Filing: —
•
Granted: 1958-10-14
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Expires: 1975-10-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:30
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F10/00; C08F10/04; C08F10/08; C08F10/10; C08F110/00; C08F110/04; C08F110/08; C08F110/10; Y; Y10; Y10S; Y10S526/00; Y10S526/908; Y10S526/912
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A METHOD OF PREPARING POLYISOBUTYLENE WHEREIN FINELY DIVIDED ALUMINUM CHLORIDE CATALYST IS ADMIXED WITH COMMERCIAL HEXANE TO FORM A CATALYST SLURRY WHICH IS THEN ADMIXED WITH ISOBUTYLENE TO THEREBY EFFECT THE POLYMERIZATION OF SAID ISOBUTYLENE, THE IMPROVEMENT WHICH COMPRISES PASSING SAID HEXANE, PRIOR TO ADMIXTURE WITH SAID FINELY DIVIDED ALUMINUM CHLORIDE CATALYST THROUGH A BED OF RELATIVELY COARSE PARTICLES OF ALUMINUM CHLORIDE AND THEN THROUGH A BED OF RELATIVELY COARSE PARTICLES OF ALUMINA, THE PARTICLES OF ALUMINUM CHLORIDE AND ALUMINA IN SAID BEDS HAVING A PARTICLE SIZE OF ABOUT 2 TO 20 MESH.
Claim 2
Dependent Claim
94 words
IN A METHOD OF PREPARING POLYISOBUTYLENE WHEREIN FINELY DIVIDED ALUMINUM CHLORIDE CATALYST IS ADMIXED WITH COMMERCIAL HEXANE TO FORM A CATALYST SLURRY WHICH IS THEN ADMIXED WITH ISOBUTYLENE TO THEREBY EFFECT THE POLYMERIZATION OF SAID ISOBUTYLENE, THE IMPROVEMENT WHICH COMPRISES PASSING SAID HEXANE, PRIOR TO ADMIXTURE WITH SAID FINELY DIVIDED ALUMINUM CHLORIDE CATALYST THROUGH A BED OF RELATIVELY COARSE PARTICLES OF ALUMINUM CHLORIDE AND THEN THROUGH A BED OF RELATIVELY COARSE PARTICLES OF ALUMINA, THE PARTICLES OF ALUMINUM CHLORIDE AND ALUMINA IN SAID BEDS HAVING A PARTICLE SIZE OF ABOUT 2 TO 20 MESH.
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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |