Patent US4126643A successfully refreshed from Google Patents.
US4126643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butadiene (1,3) conversion
Assignee: Shell USA Inc
•
Filing: 1977-11-14
•
Granted: 1978-11-21
•
Expires: 1997-11-14
Abstract
Abstract Method for the conversion of butadiene (1,3) comprising contacting butadiene (1,3) with zinc iodide, zinc bromide or mixtures thereof at a temperature of from about 150° C to about 550° C.
Inventors
- 👤 Timm E. Paxson
- 👤 Milton M. Wald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:10
CPC Classifications
C; C07; C07C; C07C2/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
Process for the conversion of butadiene (1,3) comprising, contacting butadiene (1,3) and a material selected from zinc iodide, zinc bromide, and mixtures thereof at a temperature of from about 150° C. to about 550° C.
Claim 2
Dependent Claim
35 words
Process for the conversion of butadiene (1,3) comprising, contacting butadiene (1,3) and a material selected from zinc iodide, zinc bromide, and mixtures thereof at a temperature of from about 150° C. to about 550° C.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 150° C. to about 500° C.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 170° C. to about 500° C.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 250° C. to about 550° C.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 250° C. to about 500° C.
Claim 7
Dependent Claim
11 words
The process of claim 2 wherein the material is zinc iodide.
Claim 8
Dependent Claim
11 words
The process of claim 3 wherein the material is zinc bromide.
Claim 9
Dependent Claim
17 words
The process of claim 3 wherein the material is a mixture of zinc iodide and zinc bromide.
Claim 10
Dependent Claim
11 words
The process of claim 4 wherein the material is zinc iodide.
Claim 11
Dependent Claim
11 words
The process of claim 5 wherein the material is zinc iodide.
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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |