Patent US3259607A successfully refreshed from Google Patents.
US3259607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high molecular weight polyesters
Assignee: Shell USA Inc
•
Filing: 1963-03-25
•
Granted: 1966-07-05
•
Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 Harald H O Cherdron
- 👤 Hans H Ohse
- 👤 Friedrich W A G K Korte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:46
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A PROCESS FOR THE PRODUCTION OF HIGH-MOLECULAR WEIGHT POLYACTONES COMPRISING POLYMERIZING A LACTONE SELECTED FROM THE GROUP CONSISTING OF BETA-PROPIOLACTONE, DELTA-VALEROLACTONE, AND EPSILON-CAPROLACTONE BY MAINTAINING IT IN CONTACT AT A TEMPERATURE IN THE RANGE FROM ROOM TEMPERATURE TO 100*C. WITH 10-1 TO 10-6 MOLE PER MOLE OF SAID LACTONE OF A CATALYST CONSISTING OF AN ORGANOALUMINUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINUM TRIALKYLS AND ALUMINUM ALKYL ALKOXIDES, WHEREIN THE ALKYL GROUPS HAVE FROM 1 TO 12 CARBON ATOMS, TOGETHER WITH A CAREFULLY CONTROLLED CATALYST-MODIFYING AMOUNT OF WATER IN THE RANGE FROM 1/6 TO 1 MOL PER MOL OF ALUMINUM COMPOUND.
Claim 2
Dependent Claim
102 words
A PROCESS FOR THE PRODUCTION OF HIGH-MOLECULAR WEIGHT POLYACTONES COMPRISING POLYMERIZING A LACTONE SELECTED FROM THE GROUP CONSISTING OF BETA-PROPIOLACTONE, DELTA-VALEROLACTONE, AND EPSILON-CAPROLACTONE BY MAINTAINING IT IN CONTACT AT A TEMPERATURE IN THE RANGE FROM ROOM TEMPERATURE TO 100*C. WITH 10-1 TO 10-6 MOLE PER MOLE OF SAID LACTONE OF A CATALYST CONSISTING OF AN ORGANOALUMINUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINUM TRIALKYLS AND ALUMINUM ALKYL ALKOXIDES, WHEREIN THE ALKYL GROUPS HAVE FROM 1 TO 12 CARBON ATOMS, TOGETHER WITH A CAREFULLY CONTROLLED CATALYST-MODIFYING AMOUNT OF WATER IN THE RANGE FROM 1/6 TO 1 MOL PER MOL OF ALUMINUM COMPOUND.
Claim 3
Dependent Claim
98 words
A PROCESS FOR THE PRODUCTION OF HIGH-MOLECULAR WEIGHT POLYLACTONES COMPRISING POLYMERIZING A LACTONE SELECTED FROM THE GROUP CONSISTING OF BETA-PROPIOLACTONE DELTA-VALEROLACTONE AND EPSILON-CAPROCTONE BY MAINTAINING IT IN CONTACY AT A TEMPERATURE IN THE RANGE FROM ROOM TEMPERATURE TO 100*C. WITH FROM 10-1 TO 10-6 MOLE PER MOLE OF SAID LACTONE OF A CATALYST CONSISTING OF AN ORGANO-ALUMIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMIUM ALKYL HALIDES WHEREIN THE ALKYL GROUPS HAVE FROM 1 TO 12 CARBON ATOMS, TOGETHER WITH A CAREFULLY CONTROLLED, CATALYST-MODIFYING AMOUNT OF WATER IN THE RANGE FROM 1/6 MOL PER MOL OF ALUMINUM COMPOUND
Claim 4
Dependent Claim
98 words
A PROCESS FOR THE PRODUCTION OF HIGH-MOLECULAR WEIGHT POLYLACTONES COMPRISING POLYMERIZING A LACTONE SELECTED FROM THE GROUP CONSISTING OF BETA-PROPIOLACTONE DELTA-VALEROLACTONE AND EPSILON-CAPROCTONE BY MAINTAINING IT IN CONTACY AT A TEMPERATURE IN THE RANGE FROM ROOM TEMPERATURE TO 100*C. WITH FROM 10-1 TO 10-6 MOLE PER MOLE OF SAID LACTONE OF A CATALYST CONSISTING OF AN ORGANO-ALUMIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMIUM ALKYL HALIDES WHEREIN THE ALKYL GROUPS HAVE FROM 1 TO 12 CARBON ATOMS, TOGETHER WITH A CAREFULLY CONTROLLED, CATALYST-MODIFYING AMOUNT OF WATER IN THE RANGE FROM 1/6 MOL PER MOL OF ALUMINUM COMPOUND
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |