US3959183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making catalytic structures for treating gases
Assignee: Volkswagen AG
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Filing: 1972-12-20
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Granted: 1976-05-25
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Expires: 1992-12-20
Abstract
Abstract A catalytic unit for treating gases, particularly exhaust gases of internal combustion engines, is formed by rigidly bonding together all or a peripheral portion of the particles of a mass of discrete, closely packed particles to form a bounded, unitary gas-porous structure. The particles are coated, either prior to or following bonding, with an active catalytic agent. In an embodiment of the invention especially adapted for internal combustion engine applications, the catalytic unit thus formed may advantageously be mounted within a housing by an elastic, heat-resistant member interposed between it and the housing.
Inventors
- 👤 Reinhard Gospodar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2832; F01N3/2839; F01N3/2846; F01N2330/00; F01N2330/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
A method of manufacturing a catalytic unit for treatment of gases passing through a flowpath, comprising the steps of: forming discrete catalytic support particles into a unitary gas-porous structure of a cross-sectional size generally coextensive with that of the flowpath by closely packing said particles into a gas-porous mass and rigidly bonding together at points on the surfaces thereof at least those of said particles located adjacent the periphery of said mass of particles while maintaining the porosity of said mass; and prior to or after the bonding step, coating the particles with an active catalytic agent.
Claim 2
Independent Claim
97 words
A method of manufacturing a catalytic unit for treatment of gases passing through a flowpath, comprising the steps of: forming discrete catalytic support particles into a unitary gas-porous structure of a cross-sectional size generally coextensive with that of the flowpath by closely packing said particles into a gas-porous mass and rigidly bonding together at points on the surfaces thereof at least those of said particles located adjacent the periphery of said mass of particles while maintaining the porosity of said mass; and prior to or after the bonding step, coating the particles with an active catalytic agent.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the bonding step comprises: heat-softening the surface of the particles to be bonded; and cooling the softened particles while holding them in surface-to-surface contact to bond the particles to one another.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein the bonding step further comprises applying compression to the softened particles during the cooling phase.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein the bonding step comprises cold-pressing the particles to be bonded into surface-to-surface contact with sufficient force to bond the particles together at the points of contact therebetween.
Claim 6
Dependent Claim
43 words
The method of claim 1 wherein the bonding step comprises: applying a bonding agent to the surfaces of the particles to be bonded; and bringing the particles thus applied into surface-to-surface contact to bond the particles together at the points of contact therebetween.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the bonding step is applied to all of the particles in the mass.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein the bonding step is applied only to peripherally located particles, and interiorly located particles are left substantially unbonded to one another.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the individual particles are within the range of from 1 to 20 cubic millimeters in size.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein the coating step is carried out prior to the bonding step.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein the bonding step is carried out prior to the coating step.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |