US2642466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of olefinic hydrocarbons
Assignee: Shell Development Co
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Filing: 1950-06-09
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Granted: 1953-06-16
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Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
- 👤 Garner Philip James
- 👤 Miler Sidney Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:20
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C10; C10G; C10G9/00; C10G9/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN THE PROCESS FOR PRODUCING OLEFINIC HYDROCARBONS BY VAPOR PHASE THERMAL CRACKING OF WAXY HYDROCARBONS WHEREIN A PARAFFIN WAX-CONTAINING MATERIAL IS VAPORIZED SUBSTANTIALLY AT A TEMPERATURE BELOW 500* C. AND WITHOUT SUBSTANTIAL CRACKING THEREOF AND THEREBY IS SEPARATED FROM A DIFFICULTY VAPORIZABLE FRACTION AND THE VAPORIZED PORTION IS SUBJECTED TO THERMAL CRACKING IN THE PRESENCE OF STEAM AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 500* C. O ABOUT 600* C., THE IMPROVEMENT WHICH COMPRISES THE STEPS OF SUBJECTING AT LEAST A SUBSTANTIAL PORTION OF THE SEPARATED DIFFICULTY VAPORIZABLE FRACTION TO A THERMAL SOAKING AT FROM ABOUT 390* C. TO ABOUT 450 C. FOR A PERIOD OF TIME OF FROM ABOUT 1/4 OF AN HOUR TO ABOUT 4 HOURS, THEREAFTER SUBJECTING IT TO THE AFORESAID VAPORIZING OPERATION, AND SUBJECTING THE RESULTING VAPORIZED PORTION TO THE AFORESAID VAPOR PHASE THERMAL CRACKING OPERATION.
Claim 2
Dependent Claim
142 words
IN THE PROCESS FOR PRODUCING OLEFINIC HYDROCARBONS BY VAPOR PHASE THERMAL CRACKING OF WAXY HYDROCARBONS WHEREIN A PARAFFIN WAX-CONTAINING MATERIAL IS VAPORIZED SUBSTANTIALLY AT A TEMPERATURE BELOW 500* C. AND WITHOUT SUBSTANTIAL CRACKING THEREOF AND THEREBY IS SEPARATED FROM A DIFFICULTY VAPORIZABLE FRACTION AND THE VAPORIZED PORTION IS SUBJECTED TO THERMAL CRACKING IN THE PRESENCE OF STEAM AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 500* C. O ABOUT 600* C., THE IMPROVEMENT WHICH COMPRISES THE STEPS OF SUBJECTING AT LEAST A SUBSTANTIAL PORTION OF THE SEPARATED DIFFICULTY VAPORIZABLE FRACTION TO A THERMAL SOAKING AT FROM ABOUT 390* C. TO ABOUT 450 C. FOR A PERIOD OF TIME OF FROM ABOUT 1/4 OF AN HOUR TO ABOUT 4 HOURS, THEREAFTER SUBJECTING IT TO THE AFORESAID VAPORIZING OPERATION, AND SUBJECTING THE RESULTING VAPORIZED PORTION TO THE AFORESAID VAPOR PHASE THERMAL CRACKING OPERATION.
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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |