US4576926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic hollow spheres
Assignee: California Institute of Technology
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Filing: 1984-04-23
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Granted: 1986-03-18
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Expires: 2004-04-23
Abstract
Abstract The improved, heterogeneous catalysts are in the form of gas-impervious, hollow, thin-walled spheres (10) suitably formed of a shell (12) of metal such as aluminum having a cavity (14) containing a gas at a pressure greater than atmospheric pressure. The wall material may be, itself, catalytic or the catalyst can be coated onto the sphere as a layer (16), suitably platinum or iron, which may be further coated with a layer (18) of activator or promoter. The density of the spheres (30) can be uniformly controlled to a preselected value within ±10 percent of the density of the fluid reactant such that the spheres either remain suspended or slowly fall or rise through the liquid reactant.
Inventors
- 👤 Taylor G. Wang
- 👤 Daniel D. Elleman
- 👤 Mark C. Lee
- 👤 James M. Kendall, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01J35/00; B01J35/50; B01J35/51; B01J35/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
A heterogeneous catalyst comprising hollow, spherical, gas-impervious particles comprising a metal shell containing a gas at a pressure above atmospheric and having a layer of catalyst on the surface thereof.
Claim 2
Dependent Claim
30 words
A heterogeneous catalyst comprising hollow, spherical, gas-impervious particles comprising a metal shell containing a gas at a pressure above atmospheric and having a layer of catalyst on the surface thereof.
Claim 3
Dependent Claim
20 words
A catalyst according to claim 1 in which the diameter of the particles is from 0.20 mm to 5.0 mm.
Claim 4
Dependent Claim
14 words
A catalyst according to claim 1 in which the catalyst layer includes a metal.
Claim 5
Dependent Claim
26 words
A catalyst according to claim 3 in which the metal is selected from transition metals and noble metals and the catalyst includes an activator and/or promoter.
Claim 6
Dependent Claim
12 words
A catalyst according to claim 1 in which the gas is air.
References Cited (Backward Citations)
CA763944A
Cited
US3347798A
Cited
US3538018A
Cited
US3798176A
Cited
US3978269A
Cited
US4039480A
Cited
US4344787A
Cited
GB2055787A
Cited
US4292206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |