US4152988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric match with epoxy coated fluorocarbon containing pyrotechnic composition
Assignee: United States Department of the Navy
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Filing: 1977-09-19
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Granted: 1979-05-08
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Expires: 1997-09-19
Abstract
Abstract A method of making an electric match having an electrical assembly of a p of lead-in wires and a bridge wire comprising dipping said electrical assembly into a pyrotechnic composition comprised of magnesium, polytetrafluoroethylene, and fluorocarbon rubber, and then drying said pyrotechnic composition to form a match head around said bridge wire. A waterproofing coating is applied to the match head by dipping into an epoxy coating composition.
Inventors
- 👤 Davey S. Haas
- 👤 Claude D. Helton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:28
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/195; F42B3/198; F42B3/12; F42B3/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
An electric match comprising, an electric assembly having first and second lead-in wires and a bridgewire connected across the ends of said lead-in wires, a pyrotechnic composition covering said bridgewire comprised, by weight, of between 52 and 56 percent of atomized magnesium, between 28 and 32 percent of polytetrafluoroethylene and between 14 and 18 percent of fluorocarbon rubber, and a waterproof coating covering said pyrotechnic composition, said waterproof coating being the reaction product of about 65 percent, by weight, of a liquid epoxy and about 35 percent, by weight, of an epoxy hardener.
Claim 2
Dependent Claim
93 words
An electric match comprising, an electric assembly having first and second lead-in wires and a bridgewire connected across the ends of said lead-in wires, a pyrotechnic composition covering said bridgewire comprised, by weight, of between 52 and 56 percent of atomized magnesium, between 28 and 32 percent of polytetrafluoroethylene and between 14 and 18 percent of fluorocarbon rubber, and a waterproof coating covering said pyrotechnic composition, said waterproof coating being the reaction product of about 65 percent, by weight, of a liquid epoxy and about 35 percent, by weight, of an epoxy hardener.
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |