US2980659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerization process
Assignee: Phillips Petroleum Co
•
Filing: 1958-01-13
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Granted: 1961-04-18
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Expires: 1978-01-13
Abstract
No abstract record available.
Inventors
- 👤 Donald R Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:35
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS WHICH COMPRISES COPOLYMERIZING MAJOR PROPORTION OF ETHYLENE WITH A MINOR PROPORTION OF AN ALIPHATIC OLEFIN HAVING FROM 3 TO 8 CARBON ATOMS PER MOLECULE, AT A TEMPERATURE IN THE RANGE OF 100 TO 325* F., WITH A CATALYST CONSISTING ESSENTIALLY OF SILICA-ALUMINA AS A MAJOR COMPONENET AND, AS A MINOR COMPONENTS, CHROMINUM OXIDE AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF MANGANESE, COBALT, AND NICKEL OXIDES, AT LEAST PART OF THE CHROMINUM BEING IN THE HEXAVALENT STATE
Claim 2
Dependent Claim
82 words
A PROCESS WHICH COMPRISES COPOLYMERIZING MAJOR PROPORTION OF ETHYLENE WITH A MINOR PROPORTION OF AN ALIPHATIC OLEFIN HAVING FROM 3 TO 8 CARBON ATOMS PER MOLECULE, AT A TEMPERATURE IN THE RANGE OF 100 TO 325* F., WITH A CATALYST CONSISTING ESSENTIALLY OF SILICA-ALUMINA AS A MAJOR COMPONENET AND, AS A MINOR COMPONENTS, CHROMINUM OXIDE AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF MANGANESE, COBALT, AND NICKEL OXIDES, AT LEAST PART OF THE CHROMINUM BEING IN THE HEXAVALENT STATE
References Cited (Backward Citations)
US2825721A
Cited
US2728758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |