US2967121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of wax removal
Assignee: Texaco Inc
•
Filing: 1957-04-17
•
Granted: 1961-01-03
•
Expires: 1977-04-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Allen
- 👤 Charles C Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:55
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/524
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD WHICH COMPRISES SUBJECTING SOLID WAXY HYDROCARBONS TO CONTACT WITH A NORMALLY GASEOUS HYDROCARBON AT A TEMPERATURE ABOVE THE CRITICAL TEMPERATURE OF SAID NORMALLY GASEOUS HYDROCARBON SO THAT SAID NORMALLY GASEOUS HYDROCARBON REMAINS IN THE GASEOUS STATE, AND AT AN ELEVATED PRESSURE OF AT LEAST ABOUT 1000 P.S.I.G., MAINTAINING SAID WAXY HYDROCARBONS IN CONTACT WITH THE THUS-PRESSURIZED NORMALLY GASEOUS HYDROCARBON FOR A PERIOD OF TIME SUFFICIENT TO PERMIT SAID NORMALLY GASEOUS HYDROCARBON TO PERMEATE SAID WAXY HYDROCARBONS A SUBSTANTIAL EXTENT AND TO PERMIT AT LEAST A PORTION OF SAID WAXY MATERIALS TO UNDERGO RETROGRADE VAPORIZATION INTO THE THUS-PRESSURIZED NORMALLY GASEOUS HYDROCARBON AND SUBSEQUENTLY RAPIDLY REDUCING THE PRESSURE EXERTED BY SAID NORMALLY GASEOUS HYDROCARBON UPON SAID WAXY HYDROCARBONS.
Claim 2
Independent Claim
118 words
A METHOD WHICH COMPRISES SUBJECTING SOLID WAXY HYDROCARBONS TO CONTACT WITH A NORMALLY GASEOUS HYDROCARBON AT A TEMPERATURE ABOVE THE CRITICAL TEMPERATURE OF SAID NORMALLY GASEOUS HYDROCARBON SO THAT SAID NORMALLY GASEOUS HYDROCARBON REMAINS IN THE GASEOUS STATE, AND AT AN ELEVATED PRESSURE OF AT LEAST ABOUT 1000 P.S.I.G., MAINTAINING SAID WAXY HYDROCARBONS IN CONTACT WITH THE THUS-PRESSURIZED NORMALLY GASEOUS HYDROCARBON FOR A PERIOD OF TIME SUFFICIENT TO PERMIT SAID NORMALLY GASEOUS HYDROCARBON TO PERMEATE SAID WAXY HYDROCARBONS A SUBSTANTIAL EXTENT AND TO PERMIT AT LEAST A PORTION OF SAID WAXY MATERIALS TO UNDERGO RETROGRADE VAPORIZATION INTO THE THUS-PRESSURIZED NORMALLY GASEOUS HYDROCARBON AND SUBSEQUENTLY RAPIDLY REDUCING THE PRESSURE EXERTED BY SAID NORMALLY GASEOUS HYDROCARBON UPON SAID WAXY HYDROCARBONS.
References Cited (Backward Citations)
US2318693A
Cited
US2617719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |