US2990350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation of lubricating oils
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1956-03-01
•
Granted: 1961-06-27
•
Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Alvin M Natkin
- 👤 John J Kolfenbach
- 👤 Eric O Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
C; C10; C10G; C10G32/00; C10G32/04; B; B01; B01J; B01J19/00; B01J19/08; B01J19/081; B01J19/082; C10G32/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF INCREASING THE VISCOSITY AND VISCOSITY INDEX OF A LUBRICATING OIL WHICH COMPRISES EXPOSING A LUBRICATING OIL HAVING INITIALLY A VISCOSITY IN THE RANGE OF 10 TO 2000 CS. AT 100*F., A POUR POINT IN THE RANGE OF +40* TO -75*F., AND A FLASH POINT IN THE RANGE OF 300* TO 650*F., TO GAMMA IRRADIATION UNTIL IN THE RANGE OF 10**6 TO 3X10**9 ROENTGENS OF ENERGY HAVE BEEN ABSORBED, AND RECOVERING A LUBRICATING OIL PRODUCT HAVING AN INCREASED VISCOSITY AND VISCOSITY INDEX.
Claim 2
Independent Claim
84 words
A METHOD OF INCREASING THE VISCOSITY AND VISCOSITY INDEX OF A LUBRICATING OIL WHICH COMPRISES EXPOSING A LUBRICATING OIL HAVING INITIALLY A VISCOSITY IN THE RANGE OF 10 TO 2000 CS. AT 100*F., A POUR POINT IN THE RANGE OF +40* TO -75*F., AND A FLASH POINT IN THE RANGE OF 300* TO 650*F., TO GAMMA IRRADIATION UNTIL IN THE RANGE OF 10**6 TO 3X10**9 ROENTGENS OF ENERGY HAVE BEEN ABSORBED, AND RECOVERING A LUBRICATING OIL PRODUCT HAVING AN INCREASED VISCOSITY AND VISCOSITY INDEX.
References Cited (Backward Citations)
GB697601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |