US3832413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polynuclear aromatic hydrocarbons
Assignee: Universal Oil Products Co
•
Filing: 1972-08-14
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Granted: 1974-08-27
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Expires: 1992-08-14
Abstract
Abstract Polynuclear aromatic hydrocarbons are prepared by treating a low molecular weight saturated hydrocarbon in the presence of a catalysts comprising rhodium-containing compounds and in the absence of any added or extraneous gas.
Inventors
- 👤 D Darling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:08
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/46; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
The process as set forth in claim 1 in which said rhodium-containing catalyst is rhodium composited on alumina.
Claim 2
Dependent Claim
18 words
The process as set forth in claim 1 in which said rhodium-containing catalyst iS rhodium composited on silica.
Claim 3
Dependent Claim
18 words
The process as set forth in claim 1 in which said low molecular weight saturated hydrocarbon is ethane.
Claim 4
Dependent Claim
18 words
The process as set forth in claim 1 in which said low molecular weight saturated hydrocarbon is propane.
Claim 5
Dependent Claim
18 words
The process as set forth in claim 1 in which said low molecular weight saturated hydrocarbon is butane.
Claim 6
Dependent Claim
16 words
The process as set forth in claim 1 in which said polynuclear aromatic hydrocarbon is naphthalene.
Claim 7
Dependent Claim
16 words
The process as set forth in claim 1 in which said polynuclear aromatic hydrocarbon is anthracene.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |