Patent US3694883A successfully refreshed from Google Patents.
US3694883A
Expired / Lapsed
US
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Method of mounting a nozzle insert
Assignee: United States Department of the Air Force
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Filing: 1970-05-20
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Granted: 1972-10-03
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Expires: 1990-05-20
Abstract
Abstract A method of mounting in a composite-type rocket nozzle, a nozzle insert which is substantially annular in configuration and which has four surfaces, three of which are external and uncoated, and the fourth of which is internal and is coated with pyrolytic graphite. The method includes the steps of coating the insert on the three uncoated external surfaces with a thin layer of silicone grease, coating two of the external surfaces with a layer of a filled epoxy cement on the thin layer of silicone grease, coating the third external surface with a layer of silicone rubber on the thin layer of silicone grease, and placing the insert in its proper position in the composite-type rocket nozzle. This method of mounting promotes the service life of the insert by eliminating the application of tensile stresses to the insert.
Inventors
- 👤 Eugene L Olcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:24
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/97; F02K9/974; Y; Y10; Y10S; Y10S60/00; Y10S60/909; Y10T; Y10T29/00; Y10T29/49; Y10T29/49346
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
The method of mounting, in a composite-type rocket nozzle, a nozzle insert which is substantially annular in configuration and which has four surfaces, three of which uncoated and are external, which include an entrance end external radial surface, an external longitudinal surface, and an exit end external radial surface, and the fourth surface of which is an internal longitudinal surface which is coated with pyrolytic graphite, comprising the steps of: a. coating the insert on the entrance end external radial surface, the external longitudinal surface, and the exit end external radial surface with a thin layer of silicone grease. grease; b. coating the entrance end external radial surface of the insert, and the external longitudinal surface of the insert, with a layer of filled epoxy cement on said thin layer of silicone grease already thereupon; c. coating the exit end external radial surface with a layer of silicone rubber on said thin layer of silicone grease already thereupon; d. and, placing the insert in its proper position in the composite-type rocket nozzle; whereby the insert is provided with freedom, and yet is firmly supported, and thereby the application of tensile stresses to the insert is eliminated.
Claim 2
Independent Claim
196 words
The method of mounting, in a composite-type rocket nozzle, a nozzle insert which is substantially annular in configuration and which has four surfaces, three of which uncoated and are external, which include an entrance end external radial surface, an external longitudinal surface, and an exit end external radial surface, and the fourth surface of which is an internal longitudinal surface which is coated with pyrolytic graphite, comprising the steps of: a. coating the insert on the entrance end external radial surface, the external longitudinal surface, and the exit end external radial surface with a thin layer of silicone grease. grease; b. coating the entrance end external radial surface of the insert, and the external longitudinal surface of the insert, with a layer of filled epoxy cement on said thin layer of silicone grease already thereupon; c. coating the exit end external radial surface with a layer of silicone rubber on said thin layer of silicone grease already thereupon; d. and, placing the insert in its proper position in the composite-type rocket nozzle; whereby the insert is provided with freedom, and yet is firmly supported, and thereby the application of tensile stresses to the insert is eliminated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |