US3680483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular flare grains
Assignee: Dow Chemical Co
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Filing: 1970-10-06
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Granted: 1972-08-01
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Expires: 1990-10-06
Abstract
Abstract Disclosed is an annular grain for use as an illuminating or signaling flare. The grain is prepared by pour casting a composition made up of an oxidizer, particulate magnesium and an epoxy resin-curing agent combination into a desired form and curing it into a coherent grain.
Inventors
- 👤 Gerald R Staudacher
- 👤 George A Lane
- 👤 Alan C Kott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:46
CPC Classifications
C; C06; C06B; C06B33/00; C06B33/02; C06B21/00; C06B21/0033; C06B21/0058; F; F42; F42B; F42B4/00; F42B4/26; Y; Y10; Y10S; Y10S149/00; Y10S149/11; Y10S149/112; Y10S149/113; Y10S149/114; Y10S149/116
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
The grain of claim 1 which contains from 45 to 55 percent substantially spherical magnesium particles having a mean particle size distribution of from 125 to 250 Mu in diameter.
Claim 2
Dependent Claim
25 words
The grain of claim 1 which contains from 25 to 33 percent sodium nitrate particles having mean diameters of from 15 to 250 Mu .
Claim 3
Dependent Claim
47 words
The grain of claim 1 wherein the epoxy resin is a glycerin glycidyl ether having an average functionality of between 2 and 3 and the curing agent is an amine terminated polypropylene oxide having an average molecular weight of 250 or the nitrate or perchlorate salt thereof.
Claim 4
Dependent Claim
153 words
A generally annular grain for use as a flare which comprises: a. from 21 to 50 percent of a particulate alkali metal nitrate or perchlorate as oxidizer ranging in size from 10 to 750 Mu in the longest dimension; b. from 43 to 70 percent particulate magnesium ranging in size from 25 to 250 Mu in the longest dimension; and c. the reaction product of an epoxy resin and an amine terminated polyalkylene oxide; alkylene polyamine; alkyl, aryl or mixed alkyl-aryl amine or acid anhydride curing agent in which the epoxy resin accounts for from 30 to 70 percent of the reaction product which is further characterized by containing at least 30 percent chemically combined oxygen together with a plasticizer containing at least 40 percent oxygen as binder, said binder making up from 2 to 30 percent of the grain and said plasticizer making up from 5 to 85 percent of the binder.
Claim 5
Dependent Claim
27 words
The grain of claim 5 wherein the plasticizer is nitroglycerin, diethylene glycol dinitrate, monoethanolamine nitrate, ethylene carbonate, ethylene glycol, ethylene glycol dimethyl ether, glycerin or polyglycidyl nitrate.
Claim 6
Dependent Claim
12 words
The grain of claim 5 wherein the plasticizer is triethylene glycol dinitrate.
Claim 7
Dependent Claim
35 words
The annular grain of claim 5 wherein the internal diameter is from one-fourth to three-fourths inch, the external diameter is from 1 to 3 inches and the thickness is from one-fourth to 1 1/2 inch.
Claim 8
Independent Claim
151 words
A method for preparing a generally annular grain for use as a flare which comprises: a. preparing a castable curable composition by mixing: i. from 21 to 50 percent of a particulate alkali metal nitrate or perchlorate ranging in size from 10 to 750 Mu in the longest dimension as oxidizer; ii. from 43 to 70 percent of particulate magnesium ranging in size from 25 to 250 Mu in the longest dimension; and iii. an epoxy resin and an amine terminated polyalkylene oxide; alkylene polyamine, alkyl, aryl or mixed alkyl-aryl amine or acid anhydride curing agent in which the epoxy resin accounts for from 30 to 70 percent of the mixture, the mixture being further characterized by containing at least 30 percent chemically cOmbined oxygen and making up from 18 to 24 percent of the composition; b. casting the composition into a generally annular form; and c. curing the cast composition.
Claim 9
Dependent Claim
127 words
The process of claim 9 wherein the castable composition is prepared by mixing: i. from 21 to 50 percent of a particulate alkali metal nitrate or perchlorate as oxidizer ranging in size from 10 to 750 Mu in the longest dimension; ii. from 43 to 70 percent particulate magnesium ranging in size from 25 to 250 Mu in the longest dimension; and iii. 2 to 30 percent of an epoxy resin and an amine terminated polyalkylene oxide; alkylene polyamine; alkyl, aryl or mixed alkyl-aryl amine or acid anhydride curing agent in which the epoxy resin accounts for from 30 to 70 percent of the mixture which is further characterized by containing at least 30 percent oxygen together with a plasticizer which contains at least 40 percent oxygen.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |