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US4179327A
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Process for coating pyrotechnic materials
Assignee: Honeywell International Inc
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Filing: 1978-07-13
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Granted: 1979-12-18
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Expires: 1998-07-13
Abstract
Abstract A method for preparing the surface of pyrotechnic propellant compositions for coating by emersing said compositions in an aqueous/alcohol solution.
Inventors
- 👤 Alvin A. Seldner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:19
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A method of treating the surface of a pyrotechnic propellant material prior to application of a coating on said material which comprises etching the surface of the material with a solution comprised of about 1 to 10 vol. % water and 99 to 90 vol. % of a C 1 to C 4 aliphatic alcohol for an effective amount of time.
Claim 2
Independent Claim
61 words
A method of treating the surface of a pyrotechnic propellant material prior to application of a coating on said material which comprises etching the surface of the material with a solution comprised of about 1 to 10 vol. % water and 99 to 90 vol. % of a C 1 to C 4 aliphatic alcohol for an effective amount of time.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the C 1 to C 4 alcohol is selected from the group consisting of methanol, ethanol, and isopropanol.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the solution consists of about 2 to 4 vol. % water and 98 to 96 vol. % alcohol.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein the pyrotechnic propellant is in pellet form.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the pyrotechnic material is comprised of an inorganic oxidizer, an oxygen-containing polymeric compound, and a coolant.
Claim 7
Dependent Claim
26 words
The method of claim 5 wherein the inorganic oxidizer is sodium chlorate, the oxygen-containing polymeric compound is a polyacetal resin, and the coolant is calcium hydroxide.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein the pyrotechnic material is comprised of an alkali or alkaline earth metal azide and a metal oxide.
Claim 9
Dependent Claim
19 words
The method of claim 7 wherein the alkali-metal azide is sodium azide and the metal oxide is iron oxide.
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) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |