US3981756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high density solid propellants
Assignee: United States Department of the Navy
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Filing: 1975-09-09
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Granted: 1976-09-21
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Expires: 1995-09-09
Abstract
Abstract High density solid propellants are prepared by a process which comprises mixing the solid propellant components comprising a perfluorinated polymer, such as high molecular weight polytetrafluorethylene, and an inorganic oxidizer salt, such as NF4BF4, with a dispersion containing a dissolved low molecular weight perfluorinated polymer, a suspended low molecular weight pefluorinated polymer and a suitable solvent, removing the solvent from the mixture, and drying the solids.
Inventors
- 👤 Carl Gotzmer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:44
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B21/00; C06B21/0008; C06B21/0025; Y; Y10; Y10S; Y10S149/00; Y10S149/119
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A process for preparing a high density solid propellant which comprises mixing the solid propellant components which comprise a high molecular weight perfluorinated polymer binder and an inorganic oxidizer salt with a dispersion comprising a dissolved low molecular weight perfluorinated polymer, a suspended low molecular weight perfluorinated polymer and a suitable solvent; removing the solvent; and drying the resulting solids.
Claim 2
Dependent Claim
60 words
A process for preparing a high density solid propellant which comprises mixing the solid propellant components which comprise a high molecular weight perfluorinated polymer binder and an inorganic oxidizer salt with a dispersion comprising a dissolved low molecular weight perfluorinated polymer, a suspended low molecular weight perfluorinated polymer and a suitable solvent; removing the solvent; and drying the resulting solids.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the solid propellant components additionally comprise a metal fuel.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the inorganic oxidizer salt is hydrogen sensitive.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the solvent is a liquid fluorocarbon.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein the removal of the solvent is accomplished by evaporation under reduced pressure.
Claim 7
Dependent Claim
34 words
The process of claim 4 wherein the inorganic oxidizer salt is selected from the group consisting of NF 4 BF 4 , NF 4 AsF 6 , NF 4 SbF 6 and mixtures thereof.
Claim 8
Dependent Claim
42 words
The process of claim 6 wherein the perfluorinated polymer binder is a high molecular weight polytetrafluoroethylene, the inorganic oxidizer salt is NF 4 BF 4 , the dissolved and suspended low molecular weight perfluorinated polymer is polytetrafluoroethylene and the solvent is 1,1,2-trichlorotrifluoroethane.
Claim 9
Dependent Claim
34 words
The process of claim 7 wherein the high molecular weight polytetrafluoroethylene has an average molecular weight of about 3 million, and the low molecular weight polytetrafluoroethylene has an average molecular weight of about 3700.
Claim 10
Dependent Claim
16 words
The process of claim 8 which additionally comprises pressing the dry solids into a propellant grain.
Claim 11
Dependent Claim
50 words
The process of claim 8 wherein the high molecular weight polytetrafluoroethylene has an average particle size of 30 microns and the low molecular weight polytetrafluoroethylene has a particle size such that 60% of the particles are less than 5 microns and 100% of the particles are less than 30 microns.
Claim 12
Dependent Claim
8 words
The product of the process of claim 5.
Claim 13
Dependent Claim
48 words
A high density solid propellant consisting essentially of 25 to 70% of NF 4 BF 4 , 5 to 50% of a polytetrafluoroethylene having an average molecular weight of about 3 million and 10 to 25 percent of a polytetrafluoroethylene having an average molecular weight of about 3700.
Claim 14
Dependent Claim
48 words
A high density solid propellant consisting essentially of 25 to 70% of NF 4 BF 4 , 5 to 50% of a polytetrafluoroethylene having an average molecular weight of about 3 million and 10 to 25 percent of a polytetrafluoroethylene having an average molecular weight of about 3700.
References Cited (Backward Citations)
US3753811A
Cited
US3041216A
Cited
US3520742A
Cited
US3732132A
Cited
US3797238A
Cited
US3669020A
Cited
US3853645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |