Patent US3236904A successfully refreshed from Google Patents.
US3236904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodealkylation process
Assignee: Union Carbide Corp
•
Filing: 1962-02-07
•
Granted: 1966-02-22
•
Expires: 1982-02-07
Abstract
No abstract record available.
Inventors
- 👤 Paul E Pickert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:17
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; B01J29/08; C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/08; C07C2529/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR THE HYDRODEALKYLATION OF ALKYL-SUBSTITUTED AROMATIC HYDROCARBONS COMPRISING THE STEPS OF PROVIDING AN ALKYL-SUBSTITUTED AROMATIC HYDROCARBON FEED AND CONTACTING SUCH HYDROCARBON IN A HYDROGEN ATMOSPHERE AT TEMPERATURES BETWEEN ABOUT 400 AND 650*C. WITH AN ACTIVATED METAL CATIONIC CRYSTALLINE ALUMINOSILICATE ZEOLITIC MOLECULAR SIEVE MATERIAL HAVING: (1) AN APPARENT PORE SIZE OF AT LEAST ABOUT 6.6 ANGSTROM UNITS; (2) MORE THAN ABOUT 92 PERCENT OF THE ALUMINUM ATOMS ASSOCIATED WITH CATIONS; (3) A MONOVALENT METAL CATION WHEN THE SILICA-TOALUMINA MOLAR RATIO IS GREATER THAN 3; AND (4) AN ACTIVE ELEMENTAL METAL SELECTED FROM THE GROUP CONSISTING OF COPPER, CADMIUM, TIN, LEAD, ANTIMONY, BISMUTH, MERCURY, GOLD AND GROUP VIII OF THE PERIODIC TABLE, BEING FINELY DISPERSED WITHIN THE INNER ADSORPTION REGION OF THE MOLECULAR SIEVE.
Claim 2
Dependent Claim
124 words
A PROCESS FOR THE HYDRODEALKYLATION OF ALKYL-SUBSTITUTED AROMATIC HYDROCARBONS COMPRISING THE STEPS OF PROVIDING AN ALKYL-SUBSTITUTED AROMATIC HYDROCARBON FEED AND CONTACTING SUCH HYDROCARBON IN A HYDROGEN ATMOSPHERE AT TEMPERATURES BETWEEN ABOUT 400 AND 650*C. WITH AN ACTIVATED METAL CATIONIC CRYSTALLINE ALUMINOSILICATE ZEOLITIC MOLECULAR SIEVE MATERIAL HAVING: (1) AN APPARENT PORE SIZE OF AT LEAST ABOUT 6.6 ANGSTROM UNITS; (2) MORE THAN ABOUT 92 PERCENT OF THE ALUMINUM ATOMS ASSOCIATED WITH CATIONS; (3) A MONOVALENT METAL CATION WHEN THE SILICA-TOALUMINA MOLAR RATIO IS GREATER THAN 3; AND (4) AN ACTIVE ELEMENTAL METAL SELECTED FROM THE GROUP CONSISTING OF COPPER, CADMIUM, TIN, LEAD, ANTIMONY, BISMUTH, MERCURY, GOLD AND GROUP VIII OF THE PERIODIC TABLE, BEING FINELY DISPERSED WITHIN THE INNER ADSORPTION REGION OF THE MOLECULAR SIEVE.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |