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US3900675A
Expired / Lapsed
US
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Rocket nozzle comprising pyrolytic graphite-silicon carbide microcomposite inserts
Assignee: Atlantic Research Corp
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Filing: 1973-04-24
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Granted: 1975-08-19
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Expires: 1993-04-24
Abstract
Abstract A rigid pyrolytic graphite microcomposite material comprising a matrix of pyrolytic graphite containing embedded therein codeposited crystalline silicon carbide comprising aciculae oriented approximately perpendicular to the a-b plane of the crystallite layers of the pyrolytic graphite. The SiC comprises at least about 5 volume percent of the microcomposite material, preferably at least about 10 volume percent. A rigid composite pyrolytic graphite article comprising a matrix of the above microcomposite material containing embedded therein at least one reinforcing refractory filament or strand layer. The refractory filament or strand layer comprises a plurality of unidirectional and substantially parallel, laterally spaced, individual, continuous refractory filaments or strands. The microcomposite matrix is nucleated from each of the individual refractory filaments or strands and interconnected to form a continuous matrix phase surrounding and interconnecting the individual filaments or strands comprising the embedded filament or strand layer.
Inventors
- 👤 Eugene L Olcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C01; C01B; C01B32/00; C04B35/515; C04B35/52; C04B35/522; C04B35/56; C04B35/565; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2929; Y10T428/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
67 words
ROCKET NOZZLE INSERT OF PYROLYTIC GRAPHITE MICROCOMPOSITE COMPRISING PYROLYTIC GRAPHITE CONTAINING EMBEDDED THEREIN CODEPOSITED SILICON CARBIDE COMPRISING ACICULAE OF SILICON CARBIDE, THE LONGITUDINAL AXES OF SAID ACICULAE BEING ALIGNED IN THE C-DIRECTION RELATIVE TO THE A-B PLANE OF THE ASSOCIATED PYROLYTIC GRAPHITE CRYSTALLITE AT THE POINT OF EMBEDMENT, SAID SILICON CARBIDE COMPRISING ABOUT 5 TO 95 PERCENT BY VOLUME OF SAID MICROCOMPOSITE, SAID INSERT BEING SUBSTANTIALLY CYLINDRICAL.
Claim 2
Dependent Claim
67 words
ROCKET NOZZLE INSERT OF PYROLYTIC GRAPHITE MICROCOMPOSITE COMPRISING PYROLYTIC GRAPHITE CONTAINING EMBEDDED THEREIN CODEPOSITED SILICON CARBIDE COMPRISING ACICULAE OF SILICON CARBIDE, THE LONGITUDINAL AXES OF SAID ACICULAE BEING ALIGNED IN THE C-DIRECTION RELATIVE TO THE A-B PLANE OF THE ASSOCIATED PYROLYTIC GRAPHITE CRYSTALLITE AT THE POINT OF EMBEDMENT, SAID SILICON CARBIDE COMPRISING ABOUT 5 TO 95 PERCENT BY VOLUME OF SAID MICROCOMPOSITE, SAID INSERT BEING SUBSTANTIALLY CYLINDRICAL.
Claim 3
Dependent Claim
25 words
The rocket nozzle insert of claim 1 in which the silicon carbide in said microcomposite comprises at least 10 percent by volume of said microcomposite.
Claim 4
Dependent Claim
23 words
The rocket nozzle insert of claim 2 in which the silicon carbide comprises about 10 to 50 percent by volume of said microcomposite.
Claim 5
Dependent Claim
95 words
THE ROCKET NOZZLE INSERT OF CLAIM 1 IN WHICH THE MICROCOMPOSITE COMPRISES A MATRIX CONTAINING EMBEDDED THEREIN AT LEAST ONE REINFORCING REFRACTORY FILAMENT OR STRAND LAYER, SAID FILAMENT OR STRAND LAYER COMPRISING A PLURALITY OF UNIDIRECTIONAL AND SUBSTANTIALLY PARALLEL, LATERALLY SPACED, INDIVIDUAL, CONTINOUS REFRACTORY FILAMENTS OR STRANDS, SAID MATRIX COMPRISING CRYSTALLITE LAYERS OF SAID PYROLYTIC GRAPHITESILICON CARBIDE MICROCOMPOSITE NUCLEATED FROM EACH OF SAID INDIVIDUAL FILAMENTS OR STRANDS AND INTERCONNECTED TO FORM A CONTINUOUS MATRIX PHASR SURROUNDING AND INTERCONNECTING EACH OF SAID INDIVIDUAL FILAMENTS OR STRANDS COMPRISING SAID EMBEDDED AT LEAST ONE FILAMENT OR STRAND LAYER.
Claim 6
Dependent Claim
19 words
The rocket nozzle insert of claim 4 wherein said at least one reinforcing layer comprises a plurality of layers.
Claim 7
Dependent Claim
46 words
The rocket nozzle insert of claim 5 wherein the unidirectional, substantially parallel filaments or strands comprising at least one filament or strand layer are oriented in a direction different from the unidirectional, substantially parallel filaments or strands comprising at least one other filament or strand layer.
Claim 8
Dependent Claim
13 words
The rocket nozzle insert of claim 4 wherein the refractory strand is carbon.
Claim 9
Dependent Claim
13 words
The rocket nozzle insert of claim 5 wherein the refractory strand is carbon.
Claim 10
Dependent Claim
18 words
The rocket nozzle insert of claim 1 which includes a graphite substrate onto which said microcomposite is deposited.
Claim 11
Dependent Claim
18 words
The rocket nozzle insert of claim 3 which includes a graphite substrate onto which said microcomposite is deposited.
Claim 12
Dependent Claim
26 words
The rocket nozzle insert of claim 5 wherein the silicon carbide in said microcomposite matrix comprises at least about 10 percent by volume of said matrix.
Claim 13
Dependent Claim
26 words
The rocket nozzle insert of claim 11 wherein the silicon carbide in said microcomposite matrix comprises about 10 to 50 percent by volume of said matrix.
Claim 14
Dependent Claim
26 words
The rocket nozzle insert of claim 6 wherein the silicon carbide in said microcomposite matrix comprises at least about 10 percent by volume of said matrix.
Claim 15
Dependent Claim
26 words
The rocket nozzle insert of claim 13 wherein the silicon carbide in said microcomposite matrix comprises about 10 to 50 percent by volume of said matrix.
Claim 16
Dependent Claim
13 words
The rocket nozzle insert of claim 6 wherein the refractory strand is carbon.
Claim 17
Dependent Claim
13 words
The rocket nozzle insert of claim 12 wherein the refractory strand is carbon.
Claim 18
Dependent Claim
13 words
The rocket nozzle insert of claim 14 wherein the refractory strand is carbon.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |