Patent US3789762A successfully refreshed from Google Patents.
US3789762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device to prevent accidental ignition of electro-explosives from electrostatic discharge
Assignee: United States Department of the Navy
•
Filing: 1972-03-30
•
Granted: 1974-02-05
•
Expires: 1992-03-30
Abstract
Abstract Conductive structure connected to a electroexplosive device casing and extending into close proximity to igniter electrical lead wires at a place where discharge of stray electrostatic charges across a spark gap from one or both of said lead wires to the conductive means will not cause ignition of the electroexplosive devices.
Inventors
- 👤 J Petrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:49
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/18; H; H05; H05F; H05F3/00; H05F3/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
In an electroexplosive device having a casing and a pair of lead wires connected by a bridge wire in a body of explosive material, the safety improvement comprising: an exteriorly disposed electrically conductive foil member connected to said casing by an electrically conductive adhesive and having pointed portions thereof adjacent said lead wires to form spark gaps between said lead wires and said foil member, wherein said spark gaps are insulated from said explosive material.
Claim 2
Dependent Claim
75 words
In an electroexplosive device having a casing and a pair of lead wires connected by a bridge wire in a body of explosive material, the safety improvement comprising: an exteriorly disposed electrically conductive foil member connected to said casing by an electrically conductive adhesive and having pointed portions thereof adjacent said lead wires to form spark gaps between said lead wires and said foil member, wherein said spark gaps are insulated from said explosive material.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said spark gaps are insulated by an insulating member received in said casing.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |