Patent US2559984A successfully refreshed from Google Patents.
US2559984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polymeric lubricating oils
Assignee: Gulf Research and Development Co
•
Filing: 1947-11-21
•
Granted: 1951-07-10
•
Expires: 1967-11-21
Abstract
No abstract record available.
Inventors
- 👤 Charles W Montgomery
- 👤 William I Gilbert
- 👤 Robert E Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:07
CPC Classifications
C; C10; C10G; C10G50/00; C10G50/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE PROCESS OF PREPARING A POLYMERIC LUBRICATING OIL HAVING A HIGH VISCOSITY INDEX WHICH COMPRISES CONTINUOUSLY CONTACTING AN OLEFIN, WHICH CONTAINS AT LEAST 3 CARBON ATOMS, WHILE IN THE LIQUID PHASE WITH A HALIDE POLYMERIZATION CATALYST AT A TEMPERATURE OF BETWEEN ABOUT -20* AND 40* C., AND POLYMERIZING AT LEAST ABOUT 10 PER CENT BUT NOT MORE THAN ABOUT 20 PER CENT MONOMER TO POLYMER.
Claim 2
Dependent Claim
65 words
THE PROCESS OF PREPARING A POLYMERIC LUBRICATING OIL HAVING A HIGH VISCOSITY INDEX WHICH COMPRISES CONTINUOUSLY CONTACTING AN OLEFIN, WHICH CONTAINS AT LEAST 3 CARBON ATOMS, WHILE IN THE LIQUID PHASE WITH A HALIDE POLYMERIZATION CATALYST AT A TEMPERATURE OF BETWEEN ABOUT -20* AND 40* C., AND POLYMERIZING AT LEAST ABOUT 10 PER CENT BUT NOT MORE THAN ABOUT 20 PER CENT MONOMER TO POLYMER.
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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |