Patent US2850436A successfully refreshed from Google Patents.
US2850436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of solid petroleum pitch
Assignee: Gulf Research and Development Co
•
Filing: 1954-03-16
•
Granted: 1958-09-02
•
Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Beuther Harold
- 👤 Richard G Goldthwait
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:11
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10C; C10C3/00; C10C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR THE PREPARATION OF A PETROLEUM PITCH HAVING A RING AND BALL SOFTENING POINT ABOVE ABOUT 350* F., A SPECIFIC GRAVITY BELOW ABOUT 1.200 AND SUBSTANTIALLY COMPLETE SOLUBILITY IN TRICHLOROETHYLENE AND CARBON DISULFIDE COMPRISING REDUCING AN ASPHALTIC BASE PETROLEUM CRUDE OIL TO FORM A RESIDUE HAVING AN ASPHALTENE CONTENT ABOVE ABOUT THIRTY PERCENT AND A SOFTENING POINT ABOVE ABOUT 160*F., SEVERLY VISBREAKING THE RESIDUE IN A ONCETHROUGH SHORT-TIME COIL OPERATION AT A TEMPERATURE OF 900* TO 950*F., QUENCHING THE VISBROKEN MATERIAL AS IT IS DISCHARGED FROM THE VISBREAKING COIL, AND FLASHING THE VISBROKEN RESIDUE AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AT A TEMPERATURE NOT EXCEEDING 810*F. TO FROM THE PETROLEUM PITCH AS A BOTTOMS PRODUCT.
Claim 2
Dependent Claim
115 words
A PROCESS FOR THE PREPARATION OF A PETROLEUM PITCH HAVING A RING AND BALL SOFTENING POINT ABOVE ABOUT 350* F., A SPECIFIC GRAVITY BELOW ABOUT 1.200 AND SUBSTANTIALLY COMPLETE SOLUBILITY IN TRICHLOROETHYLENE AND CARBON DISULFIDE COMPRISING REDUCING AN ASPHALTIC BASE PETROLEUM CRUDE OIL TO FORM A RESIDUE HAVING AN ASPHALTENE CONTENT ABOVE ABOUT THIRTY PERCENT AND A SOFTENING POINT ABOVE ABOUT 160*F., SEVERLY VISBREAKING THE RESIDUE IN A ONCETHROUGH SHORT-TIME COIL OPERATION AT A TEMPERATURE OF 900* TO 950*F., QUENCHING THE VISBROKEN MATERIAL AS IT IS DISCHARGED FROM THE VISBREAKING COIL, AND FLASHING THE VISBROKEN RESIDUE AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AT A TEMPERATURE NOT EXCEEDING 810*F. TO FROM THE PETROLEUM PITCH AS A BOTTOMS PRODUCT.
References Cited (Backward Citations)
US2733192A
Cited
US2305440A
Cited
US2651601A
Cited
US2633449A
Cited
US2662051A
Cited
US2762754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |