Patent US3961476A successfully refreshed from Google Patents.
US3961476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal interlayer adhesive technique
Assignee: United States Department of the Navy
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Filing: 1975-09-11
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Granted: 1976-06-08
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Expires: 1995-09-11
Abstract
Abstract A rocket motor is described in which a thin layer of metallic foil or the ke is used between a silicone rubber insulator and an isocyanate cured, hydroxy terminated polybutadiene bound propellant grain to prevent migration of isocyanate into the silicone rubber liner.
Inventors
- 👤 Bernard Wasserman
- 👤 Allen T. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:45
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0083; C06B45/00; C06B45/04; C06B45/06; C06B45/10; F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A rocket motor containing a layer of silicone rubber adjacent to the inner wall of the combustion chamber and bonded thereto, a layer of lowly exothermic metal adjacent to the inner wall of the silicone rubber layer and bonded thereto and a solid rocket propellant grain inside of and adjacent to the inner wall of the metal layer and bonded thereto, the solid propellant grain containing a binder of isocyanate cured hydroxy terminated polybutadiene.
Claim 2
Dependent Claim
74 words
A rocket motor containing a layer of silicone rubber adjacent to the inner wall of the combustion chamber and bonded thereto, a layer of lowly exothermic metal adjacent to the inner wall of the silicone rubber layer and bonded thereto and a solid rocket propellant grain inside of and adjacent to the inner wall of the metal layer and bonded thereto, the solid propellant grain containing a binder of isocyanate cured hydroxy terminated polybutadiene.
Claim 3
Dependent Claim
14 words
A rocket motor according to claim 1 wherein said lowly exothermic metal is copper.
Claim 4
Dependent Claim
17 words
A rocket motor according to claim 2 wherein said copper is in the form of a foil.
Claim 5
Independent Claim
62 words
A method for preventing the migration of isocyanate curatives from a hydroxy terminated polybutadiene bound solid propellant grain into a silicone rubber liner, said method comprising the steps of: a. placing a layer of lowly exothermic metal between said propellant grain and said silicone rubber liner; and b. bonding said layer of metal to said propellant grain and said silicone rubber liner.
Claim 6
Independent Claim
62 words
A method for preventing the migration of isocyanate curatives from a hydroxy terminated polybutadiene bound solid propellant grain into a silicone rubber liner, said method comprising the steps of: a. placing a layer of lowly exothermic metal between said propellant grain and said silicone rubber liner; and b. bonding said layer of metal to said propellant grain and said silicone rubber liner.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |