US2541693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lower olefins
Assignee: Dow Chemical Co
•
Filing: 1947-07-28
•
Granted: 1951-02-13
•
Expires: 1967-07-28
Abstract
No abstract record available.
Inventors
- 👤 Ludo K Frevel
- 👤 Wilson W Hunt
- 👤 John J Grebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:11
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/02; C07C4/04; C10; C10G; C10G9/00; C10G9/28; C10G9/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A CONTINUOUS PROCESS OF MAKING LOWER OLEFINS BY CRACKING A HYDROCARBON STREAM AT A TEMPERATURE ABOVE 1300* F., A PROCEDURE FOR QUENCHING THE HOT CRACKED GAS AND REMOVING ACETYLENE THEREFROM WHICH COMPRISES: PASSING THE HOT CRACKED GAS THROUGH A QUENCH ZONE INTO CONTACT WITH A MASS OF RELATIVELY COOL MOVING REFRACTORY PEBBLES SUPPLIED TO THE ZONE AT AN INITIAL TEMPERATURE BELOW 600* F. AND HAVING DEPOSITED THEREON AT LEAST ONE SUBSTANCE OF THE CLASS CONSISTING OF THE OXIDES OF COPPER AND IRON TO QUENCH THE STREAM, DURING WHICH OPERATION ACETYLENE IS DECOMPOSED AND THE PEBBLES BECOME HEATED AND COATED WITH CARBON, TRANSFERRING THE HEATED COATED PEBBLES TO A REGENERATION ZONE AND MOVING THEM THERETHROUGH, PASSING A NON-COMBUSTIBLE OXYGEN-CONTAINING GAS COUNTERCURRENT TO THE MASS IN THE SAID ZONE TO CATALYTICALLY BURN OFF CARBON FROM THE PEBBLES,
Claim 2
Dependent Claim
136 words
IN A CONTINUOUS PROCESS OF MAKING LOWER OLEFINS BY CRACKING A HYDROCARBON STREAM AT A TEMPERATURE ABOVE 1300* F., A PROCEDURE FOR QUENCHING THE HOT CRACKED GAS AND REMOVING ACETYLENE THEREFROM WHICH COMPRISES: PASSING THE HOT CRACKED GAS THROUGH A QUENCH ZONE INTO CONTACT WITH A MASS OF RELATIVELY COOL MOVING REFRACTORY PEBBLES SUPPLIED TO THE ZONE AT AN INITIAL TEMPERATURE BELOW 600* F. AND HAVING DEPOSITED THEREON AT LEAST ONE SUBSTANCE OF THE CLASS CONSISTING OF THE OXIDES OF COPPER AND IRON TO QUENCH THE STREAM, DURING WHICH OPERATION ACETYLENE IS DECOMPOSED AND THE PEBBLES BECOME HEATED AND COATED WITH CARBON, TRANSFERRING THE HEATED COATED PEBBLES TO A REGENERATION ZONE AND MOVING THEM THERETHROUGH, PASSING A NON-COMBUSTIBLE OXYGEN-CONTAINING GAS COUNTERCURRENT TO THE MASS IN THE SAID ZONE TO CATALYTICALLY BURN OFF CARBON FROM THE PEBBLES,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |