US3891009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-temperature heat-insulating structure
Assignee: Toyota Motor Corp
•
Filing: 1974-02-20
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Granted: 1975-06-24
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Expires: 1994-02-20
Abstract
Abstract A high-temperature heat-insulating structure having a ceramic heat-insulating layer wherein foamable perlite particles and alumina are introduced into an Aqueous Solution of Monaaluminum Phosphate (Al2O3.3P2O5.6H2O) to form a paste, the resultant paste is used to fill the space between the walls of a double-walled structure, and is fired at a high temperature.
Inventors
- 👤 Fumiyoshi Noda
- 👤 Yukihisa Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14; C; C04; C04B; C04B28/00; C04B28/34; F01N2310/00; F01N2310/06; Y; Y10; Y10S; Y10S106/00; Y10S106/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
A HEAT-INSULATING STRUCTURE COMPRISING A CASING FILLED WITH A FIRED CERAMIC CONSISTING ESSENTIALLY OF MONOALUMINUM PHOSPHATE, FOAMED PERLITE AND ALUMINA.
Claim 2
Dependent Claim
20 words
A HEAT-INSULATING STRUCTURE COMPRISING A CASING FILLED WITH A FIRED CERAMIC CONSISTING ESSENTIALLY OF MONOALUMINUM PHOSPHATE, FOAMED PERLITE AND ALUMINA.
Claim 3
Dependent Claim
29 words
A heat-insulating structure as claimed in claim 1 in which said casing is defined by the inner and outer walls of a double-walled component of an automotive exhaust system.
Claim 4
Independent Claim
33 words
A method of making a heat-insulating structure which comprises the steps of introducing into a casing a mixture of water, monoaluminum phosphate, foamable perlite, and alumina, and firing said mixture within said casing.
Claim 5
Independent Claim
33 words
A method of making a heat-insulating structure which comprises the steps of introducing into a casing a mixture of water, monoaluminum phosphate, foamable perlite, and alumina, and firing said mixture within said casing.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 2 in which said mixture is heated within said casing at about 550**650*C more than 20 minutes.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 3 in which said mixture comprises substantially equal parts of water and monoaluminum phosphate by weight.
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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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |