US4137851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic ignition circuit
Assignee: Diehl Verwaltungs Stiftung
•
Filing: 1977-11-07
•
Granted: 1979-02-06
•
Expires: 1997-11-07
Abstract
Abstract An electronic ignition circuit for the self-destruction of a projectile fuse, including a voltage source and a charging condenser determinative of the time interval until self-destruction. A threshold switch is responsive to a predetermined minimum voltage at the charging condenser for igniting an igniter, and an electronic control circuit is connected between the voltage source and the charging condenser.
Inventors
- 👤 Peter F. Weidner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:35
CPC Classifications
F; F42; F42C; F42C11/00; F42C11/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
In an electronic ignition circuit for the self-destruction of a projectile fuse, including a voltage source, a charging condenser for determining the time interval for self-destruction, a threshold switch actuatable upon a predetermined minimum voltage being reached at the voltage potential pole of said charging condenser so as to ignite an igniter; and an electronic control circuit being connected intermediate the voltage potential pole of said voltage source and the voltage potential pole of said charging condenser, the improvement comprising: said electronic control circuit being connected in said ignition circuit to provide a constant current source for maintaining the recharging current flowing from said voltage source to said charging condenser and to said threshold switch essentially constant independently of the drop in the differential voltage between said voltage potential poles during charging.
Claim 2
Dependent Claim
132 words
In an electronic ignition circuit for the self-destruction of a projectile fuse, including a voltage source, a charging condenser for determining the time interval for self-destruction, a threshold switch actuatable upon a predetermined minimum voltage being reached at the voltage potential pole of said charging condenser so as to ignite an igniter; and an electronic control circuit being connected intermediate the voltage potential pole of said voltage source and the voltage potential pole of said charging condenser, the improvement comprising: said electronic control circuit being connected in said ignition circuit to provide a constant current source for maintaining the recharging current flowing from said voltage source to said charging condenser and to said threshold switch essentially constant independently of the drop in the differential voltage between said voltage potential poles during charging.
Claim 3
Dependent Claim
14 words
A circuit as claimed in claim 1, said threshold switch comprising a four-layer diode.
Claim 4
Dependent Claim
14 words
A circuit as claimed in claim 1, said threshold switch comprising a transistor circuit.
Claim 5
Dependent Claim
14 words
A circuit as claimed in claim 1, said voltage source comprising a storage condenser.
Claim 6
Dependent Claim
67 words
A circuit as claimed in claim 1, said constant current source comprising a field effect transistor, and a resistor connected in series with the drain-source section of said transistor, said resistor and the gate electrode of said transistor being connected to the voltage potential pole of said charging condenser, and the drain electrode of said transistor being connected to the voltage potential pole of said storage condenser.
Claim 7
Dependent Claim
20 words
A circuit as claimed in claim 5, comprising a series resistor connected intermediate said drain electrode and said storage condenser.
References Cited (Backward Citations)
DE1104397B
Cited
DE1155037B
Cited
US3732823A
Cited
US3548749A
Cited
DE1948382A1
Cited
DE2104422A1
Cited
DE2113126A1
Cited
US3808975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |