US4092194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making ceramic refractory oxide fiber-reinforced ceramic tube
Assignee: EIDP Inc
•
Filing: 1976-07-30
•
Granted: 1978-05-30
•
Expires: 1996-07-30
Abstract
Abstract A reticulated tube of reinforced ceramic fibers is provided as a catalyst carrier for use in the catalytic conversion of internal combustion engine exhaust fumes. The tube is comprised of multiple layers of continuous yarn of selected ceramic fibers which can be bonded, if desired, with a substantially nonporous binder having selected properties and contained in a refractory oxide matrix having selected properties.
Inventors
- 👤 James R. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:02
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2835; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; C; C04; C04B; C04B30/00; C04B30/02; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/44; C04B35/443; C04B35/622; C04B35/626; C04B35/62605; C04B35/6261; C04B35/628; C04B35/62802; C04B35/62805; C04B35/62813; C04B35/63; C04B35/6303; C04B35/6316; C04B35/71; C04B35/78; C04B35/80; C04B35/82; F01N3/2825; F01N3/2839; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/3218; C04B2235/322; C04B2235/34; C04B2235/3418; C04B2235/44; C04B2235/444; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/5268; C04B2235/54; C04B2235/5418; C04B2235/5445; C04B2235/5454; C04B2235/60; C04B2235/602; C04B2235/6028; C04B2235/614; C04B2235/70; C04B2235/94; F01N2330/00; F01N2330/10; F01N2330/101; F01N2330/102; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A process for the preparation of a fiber-reinforced ceramic tube with fluid permeable walls comprising the steps of A. plying separate yarns of 1. a refractory oxide fiber having a softening point above about 750° C. or a fiber of a precursor of the refractory oxide and 2. a ceramic binder fiber having a softening point above about 750° C. but at least 50° C. lower than the yarn sag temperature of refractory oxide fiber B. winding the plied yarn on a tubular core in multiple layers of spaced helical coils in a criss-cross fashion to form a tube of yarn having a multitude of channels of quadrilateral-shaped cross-sections extending through the walls of the tube of yarn, C. firing the tube of yarn for a time and temperature sufficient to
Claim 2
Dependent Claim
131 words
A process for the preparation of a fiber-reinforced ceramic tube with fluid permeable walls comprising the steps of A. plying separate yarns of 1. a refractory oxide fiber having a softening point above about 750° C. or a fiber of a precursor of the refractory oxide and 2. a ceramic binder fiber having a softening point above about 750° C. but at least 50° C. lower than the yarn sag temperature of refractory oxide fiber B. winding the plied yarn on a tubular core in multiple layers of spaced helical coils in a criss-cross fashion to form a tube of yarn having a multitude of channels of quadrilateral-shaped cross-sections extending through the walls of the tube of yarn, C. firing the tube of yarn for a time and temperature sufficient to
Claim 3
Dependent Claim
80 words
convert any precursor fibers present to refractory oxide fibers and 2. soften the ceramic binder fiber to such an extent that it at least partially flows around the refractory oxide fibers to bind adjacent fibers upon cooling, and D. placing a coating composition on the bonded structure and firing to form a refractory oxide matrix at least partially surrounding said fibers but not closing said channels and to provide said tube with a compressive strength of at least 30 psi.
Claim 4
Dependent Claim
80 words
convert any precursor fibers present to refractory oxide fibers and 2. soften the ceramic binder fiber to such an extent that it at least partially flows around the refractory oxide fibers to bind adjacent fibers upon cooling, and D. placing a coating composition on the bonded structure and firing to form a refractory oxide matrix at least partially surrounding said fibers but not closing said channels and to provide said tube with a compressive strength of at least 30 psi.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein the coating composition contains 60-90% by weight of particles of a refractory oxide and 10-40% by weight of particles of a refractory oxide precursor.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the ceramic binder fiber has a maximum softening point of about 1300° C.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the plied yarns are wound at winding angles of 3° to 52°.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein said refractory oxide fibers contain at least 70% by weight Al 2 O 3 .
Claim 9
Dependent Claim
40 words
The process of claim 1 wherein said firing converts said ceramic binder fiber to fused glass which constitutes 15 to 40% by weight of said tube, and said refractory oxide matrix constitute 15 to 60% by weight of said tube.
References Cited (Backward Citations)
US3117055A
Cited
US3189563A
Cited
US3495950A
Cited
US3793041A
Cited
US3843561A
Cited
US3828934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |