Patent US4380166A successfully refreshed from Google Patents.
Patent US3873350A successfully refreshed from Google Patents.
US3873350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating honeycombed substrates
Assignee: Corning Glass Works
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Filing: 1973-02-20
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Granted: 1975-03-25
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Expires: 1993-02-20
Abstract
Abstract A honeycombed substrate to be coated with a slurry is first heated to a temperature in excess of the boiling point of the slurry liquid medium. The substrate is slowly dipped into the slurry with the axes of the cells extending substantially vertically while maintaining the uppermost ends of the cells above the upper surface of the slurry until the air within the cells has escaped. After the substrate has been removed from the slurry, the substrate is periodically inverted and/or subjected to a series of shakes or jerks while draining under the influence of gravity with the open cell axes extending substantially vertically after each inversion. The substrate is then rotated around a horizontal axis of rotation which extends substantially parallel with the axes of the substrate cells. Forced air is passed through the cells from alternate ends of the substrate until the slurry no longer flows within the cells. The coated substrate is then dried and fired.
Inventors
- 👤 Thomas J Dwyer
- 👤 George P Pesansky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:59
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; B; B01; B01J; B01J31/00; B01J31/02; B01J31/12; B01J31/123; B01J31/124; B01J37/00; B01J37/02; B01J37/0215; B28; B28B; B28B11/00; B28B11/04; B28B11/045; C04B41/009; C04B41/45; C04B41/4505; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
224 words
A METHOD OF UNIFORMLY COATING RELATIVELY THIN POROUS WALLS OF A CERAMIC HONEYCOMBED SUBSTRATE FORMING A MULTIPLICITY OF ELONGATED OPEN-ENDED CELLS EXTENDING LONGITUDINALLY FROM ONE END OF THE SUBSTRATE TO THE OTHER, SAID CELLS HAVING SUBSTANTIALLY PARALLEL CELL AXES WITH A CELL DENSITY IN EXCESS OF 20 CELLS OER SQUARE INCH OF CROSS-SECTIONAL AREA TRANSVERSE TO THE CELL AXES, SAID METHOD COMPRISING: MIXING A SLURRY COMPRISING A LIQUID MEDIUM AND SOLIDS MAINTAINED IN SUBSTANTIALLY UNIFORM SUSPENSION IN SAID LIQUID MEDIUM; HEATING SAID SUBSTRATE TO A TEMPERATURE IN EXCESS OF THE BOILING POINT OF SAID LIQUID MEDIUM; AND DIPPING ONE END OF SAID HEATED SUBSTRATE IN SAID SLURRY WHILE MAINTAINING A SUBSTANTIAL ANGLE BETWEEN THE AXES OF SAID CELLS AND THE SURFACE OF SAID LIQUID MEDIUM AS SAID SUBSTRATE IS LOWERED IN SAID SLURRY SO AS TO SUBSTANTIALLY PRECLUDE SAID SLURRY FROM ENTERING SAID CELLS FROM SAID OTHER END OF SAID SUBSTRATE WHILE THE AIR IS ESCAPING FROM SAID OTHER END AS SAID SLURRY RISES IN SAID CELLS; SAID HEATING OF SAID SLURRY SUBSTANTIALLY NEGATING THE CAPILLARY ACTION WITHIN SAID CELLS AS SAID SUBSTRATE IS LOWERED IN SAID SLURRY SO AS TO ALLOW THE SOLIDS OF SAID SLURRY TO REMAIN UNIFROMLY SUSPENDED IN SAID LIQUID MEDIUM AS SAID SLURRY COATS THE CELL WALLS THEREBY ACHIEVING A SUBSTANTIALLY UNIFORM COATING SAID SOLIDS ON SAID CELL WALLS.
Claim 2
Independent Claim
224 words
A METHOD OF UNIFORMLY COATING RELATIVELY THIN POROUS WALLS OF A CERAMIC HONEYCOMBED SUBSTRATE FORMING A MULTIPLICITY OF ELONGATED OPEN-ENDED CELLS EXTENDING LONGITUDINALLY FROM ONE END OF THE SUBSTRATE TO THE OTHER, SAID CELLS HAVING SUBSTANTIALLY PARALLEL CELL AXES WITH A CELL DENSITY IN EXCESS OF 20 CELLS OER SQUARE INCH OF CROSS-SECTIONAL AREA TRANSVERSE TO THE CELL AXES, SAID METHOD COMPRISING: MIXING A SLURRY COMPRISING A LIQUID MEDIUM AND SOLIDS MAINTAINED IN SUBSTANTIALLY UNIFORM SUSPENSION IN SAID LIQUID MEDIUM; HEATING SAID SUBSTRATE TO A TEMPERATURE IN EXCESS OF THE BOILING POINT OF SAID LIQUID MEDIUM; AND DIPPING ONE END OF SAID HEATED SUBSTRATE IN SAID SLURRY WHILE MAINTAINING A SUBSTANTIAL ANGLE BETWEEN THE AXES OF SAID CELLS AND THE SURFACE OF SAID LIQUID MEDIUM AS SAID SUBSTRATE IS LOWERED IN SAID SLURRY SO AS TO SUBSTANTIALLY PRECLUDE SAID SLURRY FROM ENTERING SAID CELLS FROM SAID OTHER END OF SAID SUBSTRATE WHILE THE AIR IS ESCAPING FROM SAID OTHER END AS SAID SLURRY RISES IN SAID CELLS; SAID HEATING OF SAID SLURRY SUBSTANTIALLY NEGATING THE CAPILLARY ACTION WITHIN SAID CELLS AS SAID SUBSTRATE IS LOWERED IN SAID SLURRY SO AS TO ALLOW THE SOLIDS OF SAID SLURRY TO REMAIN UNIFROMLY SUSPENDED IN SAID LIQUID MEDIUM AS SAID SLURRY COATS THE CELL WALLS THEREBY ACHIEVING A SUBSTANTIALLY UNIFORM COATING SAID SOLIDS ON SAID CELL WALLS.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the axes of said cells extend substantially vertically with respect to the surface of said slurry during dipping.
Claim 4
Dependent Claim
64 words
The method of claim 1 further comprising: rotating said dipped substrate around an axis of rotation extending from said one end to said other end of said substrate and substantially parallel with the axes of said cells so as to flow said slurry on said walls of said cells, said axis of rotation forming an angle of 0*-25* with respect to a horizontal plane.
Claim 5
Dependent Claim
41 words
The method of claim 3 further comprising: forcing a gaseous drying medium into said cells from alternate ends of said substrate while rotating said substrate to dry said slurry until the slurry no longer flows on the walls of said cells.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said gaseous drying medium is also forced over the exterior of said substrate.
Claim 7
Dependent Claim
43 words
The method of claim 1 further comprising: draining excess slurry from said substrate by supporting said substrate with said cell axes extending substantially vertically and periodically inverting said substrate so as to allow excess slurry to drain from both ends of said substrate.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said substrate is heated to a temperature of 2*-50*C. in excess of the boiling point of said liquid medium.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein said solids comprise a high surface area oxide of a metal.
Claim 10
Dependent Claim
41 words
The method of claim 1 wherein said solids comprise a precursor of a high surface area oxide of a metal and including the step of firing the dried coating on the substrate so as to convert said precursor to said oxide.
Claim 11
Dependent Claim
11 words
The method of claim 9 wherein said precursor comprises hydrated alumina.
Claim 12
Dependent Claim
32 words
The method of claim 10 wherein said slurry further comprises an organo-silicon compound having a polysiloxane chain structure containing a plurality of silanol groups and said liquid medium comprises an organic solvent.
Claim 13
Dependent Claim
72 words
The method of claim 1 further comprising: rotating the coated substrate around an axis of rotation extending from said one end to said other end of said substrate so as to flow said slurry on the walls of said cells, said axis of rotation forming an angle of 0*-25* with respect to a horizontal plane; and forcing a gaseous drying medium into said cells while rotating said substrate to dry said slurry.
Claim 14
Dependent Claim
46 words
The method of claim 12 wherein said gaseous drying medium is forced into said cells from alternate ends of said substrate and over the exterior of said substrate while rotating said substrate to dry said slurry until said slurry no longer flows on said cell walls.
Claim 15
Dependent Claim
15 words
The method of claim 12 wherein said substrate is rotated at 1-15 revolutions per minute.
Claim 16
Dependent Claim
12 words
The method of claim 12 wherein said gaseous drying medium comprises air.
Claim 17
Dependent Claim
50 words
The method of claim 12 further comprising: draining excess slurry from said substrate after coating and before rotating said substrate by supporting said substrate with said cell axes extending substantially vertically and periodically inverting said substrate so as to allow excess slurry to drain from both ends of said substrate.
Claim 18
Dependent Claim
33 words
The method of claim 12 wherein said solids comprise at least one substance selected from the group consisting of (1) high surface area oxides of metals, and (2) precursors of said metal oxides.
Claim 19
Dependent Claim
33 words
The method of claim 17 wherein said substance is a said precursor and including the step of firing the dried coating on the substrate so as to convert said precursor to said oxide.
Claim 20
Dependent Claim
18 words
The method of claim 18 wherein the precursor comprises hydrated alumina and the metal oxide comprises gamma alumina.
Claim 21
Dependent Claim
35 words
The method of claim 19 wherein said slurry further comprises an organo-silicon compound having a polysiloxane chain structure containing a plurality of silanol groups and said liquid medium of said slurry comprises an organic solvent.
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |