Patent US4035260A successfully refreshed from Google Patents.
US4035260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hydrogenation catalysts of improved distribution of active components
Assignee: Wyeth Holdings LLC
•
Filing: 1976-01-29
•
Granted: 1977-07-12
•
Expires: 1996-01-29
Abstract
Abstract Reductive deposition of a platinum metal on a preformed porous carbon support provides increased intensity ratios of support/platinum metal as the average pore radius of the carbon support increases.
Inventors
- 👤 Joseph Lawrence Schmitt, Jr.
- 👤 Jacob Solomon Brinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:33
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J23/00; B01J23/38; B01J23/40; B01J21/00; B01J21/18; B01J35/61; B01J35/615; B01J35/617; B01J35/63; B01J35/635; B01J35/64; B01J35/647; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/509
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A process for providing an improved distribution of active component of a hydrogenation catalyst which comprises selecting a pre-formed porous carbon support having a pore radius of at least about 25 angstrom units, a surface area provided by said pores in the range of about 300 to 700 square meters per gram, and a compacted bulk density in the range of about 0.3 to 0.8 grams per cubic centimeters, reductively depositing upon said support an amount of a platinum metal in the range from about a thousandth to about 15 percent by weight, and obtaining an increased support/intensity ratio by selecting a carbon support having an increased average pore radius.
Claim 2
Dependent Claim
110 words
A process for providing an improved distribution of active component of a hydrogenation catalyst which comprises selecting a pre-formed porous carbon support having a pore radius of at least about 25 angstrom units, a surface area provided by said pores in the range of about 300 to 700 square meters per gram, and a compacted bulk density in the range of about 0.3 to 0.8 grams per cubic centimeters, reductively depositing upon said support an amount of a platinum metal in the range from about a thousandth to about 15 percent by weight, and obtaining an increased support/intensity ratio by selecting a carbon support having an increased average pore radius.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the platinum metal is rhodium.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the platinum metal is deposited from water.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the platinum metal is deposited from aqueous dimethyl formamide.
Claim 6
Dependent Claim
11 words
The process of claim 3 wherein the platinum metal is rhodium.
Claim 7
Dependent Claim
11 words
The process of claim 4 wherein the platinum metal is rhodium.
References Cited (Backward Citations)
US3138560A
Cited
US3663166A
Cited
US3793224A
Cited
US3979329A
Cited
US3736265A
Cited
US3736266A
Cited
US3974227A
Cited
US3864281A
Cited
US3804779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |