US2735875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of cycloalkadiene
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
•
Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:50
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/02; C07C4/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
IN THE CRACKING OF CYCLOPENTADIENE DIMER CONCENTRATE, THE IMPROVEMENT WHICH COMPRISES PASSING CYCLOPENTADIENE MONOMER FORMED FROM SAID CONCENTRATE IN A CRACKING ZONE WITH UNCRACKED DIMER WITH HYDROCARBONS IN THE C7-C9 RANGE INTO AN INTERMEDIATE FRACTIONATION ZONE, MAINTAINING CONDITIONS IN SAID INTERMEDIATE FRACTIONATION ZONE SUCH AS TO CONDENSE VAPORS OF THE DIMER AND REFLUX THE CONDENSED DIMER WHILE MONOMER OF THE CYCLOPENTADIENE REMAINS IN VAPOR PHASE WITH HYDROCARBONS IN THE C7-C9 RANGE; RETURNING THE REFLUX OF THE DIMER TO THE CRACKING ZONE FROM SAID INTERMEDIATE FRACTIONATION ZONE BUT RETAINING SAID C7-C9 HYDROCARBONS IN A VAPOR STREAM FRON SAID INTERMEDIATE FRACTIONATION ZONE TO PREVENT THEIR RETURN WITH THE REFLUX TO THE CRACKING ZONE, PASSING THE REMAINING VAPORS CONTAINING CYCLOPENTADIENE MONOMER WITH HYDROCARBONS IN THE C7-C9 RANGE TO AN INTERMEDIATE PART OF MONOMER FRACTIONATING ZONE, CONDENSING VAPORS OF HYDROCARBONS IN THE C7-C9 RANGE AND HYDROCARBONS HIGHER BOILING THAN THE CYCLOPENTADIENE MONOMER IN SAID MONOMER PRODUCT FRACTIONATION ZONE, WITHDRAWING OVERHEAD MONOMER VAPORS FROM SAID PRODUCT FRACTIONATION ZONE, AND PURGING THE RESULTING BOTTOMS OF THE PRODUCT-FRACTIONATION ZONE INCLUDING THE CONDENSED HYDRECARBONS IN THE C7-C9 RANGE.
Claim 2
Dependent Claim
180 words
IN THE CRACKING OF CYCLOPENTADIENE DIMER CONCENTRATE, THE IMPROVEMENT WHICH COMPRISES PASSING CYCLOPENTADIENE MONOMER FORMED FROM SAID CONCENTRATE IN A CRACKING ZONE WITH UNCRACKED DIMER WITH HYDROCARBONS IN THE C7-C9 RANGE INTO AN INTERMEDIATE FRACTIONATION ZONE, MAINTAINING CONDITIONS IN SAID INTERMEDIATE FRACTIONATION ZONE SUCH AS TO CONDENSE VAPORS OF THE DIMER AND REFLUX THE CONDENSED DIMER WHILE MONOMER OF THE CYCLOPENTADIENE REMAINS IN VAPOR PHASE WITH HYDROCARBONS IN THE C7-C9 RANGE; RETURNING THE REFLUX OF THE DIMER TO THE CRACKING ZONE FROM SAID INTERMEDIATE FRACTIONATION ZONE BUT RETAINING SAID C7-C9 HYDROCARBONS IN A VAPOR STREAM FRON SAID INTERMEDIATE FRACTIONATION ZONE TO PREVENT THEIR RETURN WITH THE REFLUX TO THE CRACKING ZONE, PASSING THE REMAINING VAPORS CONTAINING CYCLOPENTADIENE MONOMER WITH HYDROCARBONS IN THE C7-C9 RANGE TO AN INTERMEDIATE PART OF MONOMER FRACTIONATING ZONE, CONDENSING VAPORS OF HYDROCARBONS IN THE C7-C9 RANGE AND HYDROCARBONS HIGHER BOILING THAN THE CYCLOPENTADIENE MONOMER IN SAID MONOMER PRODUCT FRACTIONATION ZONE, WITHDRAWING OVERHEAD MONOMER VAPORS FROM SAID PRODUCT FRACTIONATION ZONE, AND PURGING THE RESULTING BOTTOMS OF THE PRODUCT-FRACTIONATION ZONE INCLUDING THE CONDENSED HYDRECARBONS IN THE C7-C9 RANGE.
References Cited (Backward Citations)
US2511936A
Cited
US2372237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |