US3578520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal insulation and bond for solid fuel motors and method of making same
Assignee: General Electric Co
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Filing: 1968-07-17
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Granted: 1971-05-11
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Expires: 1988-07-17
Abstract
Abstract IMPROVED MEANS FOR BONDING A ROCKET PROPELLANT GRAIN TO ITS CASING AND THERMALLY INSULATING THE GRAIN FROM THE CASING COMPRISES THE INTERPOSITION BETWEEN THE GRAIN AND CASING OF A ROOM-TEMPERATURE CURING AND FOAMING ELASTOMERIC MATERIAL WITH CHAR RETENTION ADDITIVES. THE PREFERRED ELASTOMERIC MATERIALS ARE SILICONES AND SILICONE EPOXIES. GENERALLY, A THIN LAYER OF THE INSULATIVE-ADHESIVE FOAMING MATERIAL IS FIRST APPLIED EITHER TO THE OUTER SURFACE OF THE PREFORMED ROCKET GRAIN OR TO THE INNER SURFACE OF THE ROCKET GRAIN CASING. THE GRAIN AND CASING ARE THEN ASSEMBLED AND THE ELASTOMER IS ALLOWED TO FOAM, FILLING THE SPACE BETWEEN THE ROCKET GRAIN AND THE CASING.
Inventors
- 👤 Calvin M Dolan
- 👤 John S Axelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |