US3878790A — Seismic blaster circuit

Claim 1

Independent Claim 14 words

a shooting capacitor having sufficient capacity to fire a substantial plurality of blasting caps,

Claim 2

Dependent Claim 14 words

a shooting capacitor having sufficient capacity to fire a substantial plurality of blasting caps,

Claim 3

Dependent Claim 82 words

Blaster circuit for seismic operations, comprising in combination a shooting capacitor having sufficient capacity to fire a substantial number of blasting caps, first alternative circuit means for connecting a source of e.m.f. across said shooting capacitor for charging same, second alternative circuit means for connecting said blasting caps across said shooting capacitor in series with electronic gate means for permitting maximum current flow immediately when said gate is triggered, and a single-pole double-throw switch for alternatively completing said first or second circuit.

Claim 4

Dependent Claim 82 words

Blaster circuit for seismic operations, comprising in combination a shooting capacitor having sufficient capacity to fire a substantial number of blasting caps, first alternative circuit means for connecting a source of e.m.f. across said shooting capacitor for charging same, second alternative circuit means for connecting said blasting caps across said shooting capacitor in series with electronic gate means for permitting maximum current flow immediately when said gate is triggered, and a single-pole double-throw switch for alternatively completing said first or second circuit.

Claim 5

Dependent Claim 82 words

Blaster circuit for seismic operations, comprising in combination a shooting capacitor having sufficient capacity to fire a substantial number of blasting caps, first alternative circuit means for connecting a source of e.m.f. across said shooting capacitor for charging same, second alternative circuit means for connecting said blasting caps across said shooting capacitor in series with electronic gate means for permitting maximum current flow immediately when said gate is triggered, and a single-pole double-throw switch for alternatively completing said first or second circuit.

Claim 6

Dependent Claim 82 words

Blaster circuit for seismic operations, comprising in combination a shooting capacitor having sufficient capacity to fire a substantial number of blasting caps, first alternative circuit means for connecting a source of e.m.f. across said shooting capacitor for charging same, second alternative circuit means for connecting said blasting caps across said shooting capacitor in series with electronic gate means for permitting maximum current flow immediately when said gate is triggered, and a single-pole double-throw switch for alternatively completing said first or second circuit.

Claim 7

Dependent Claim 34 words

Blaster circuit according to claim 1 wherein said electronic gate means comprises a silicon controlled rectifier having a control electrode, and means for applying a potential to said control electrode to trigger said gate

Claim 8

Dependent Claim 18 words

first circuit means for connecting a source of DC potential across said shooting capacitor 1 for charging same,

Claim 9

Dependent Claim 18 words

first circuit means for connecting a source of DC potential across said shooting capacitor 1 for charging same,

Claim 10

Dependent Claim 8 words

a silicon controlled rectifier having a control electrode,

Claim 11

Dependent Claim 8 words

a silicon controlled rectifier having a control electrode,

Claim 12

Dependent Claim 71 words

Blaster circuit according to claim 2 wherein said potential applying means comprises (a) a source of low e.m.f., (b) a capacitor, (c) a unijunction transistor connected across said source of low e.m.f., and (d) third circuit means for connecting said capacitor (b) to said transistor (c), and (e) fourth circuit means for connecting said transistor (c) to said control electrode of said silicon controlled rectifier in order to trigger said rectifier.

Claim 13

Dependent Claim 54 words

Blaster circuit according to claim 3, wherein said potential applying means also comprises (f) a second switch for alternatively connecting said capacitor (b) across said source of low e.m.f. (a) to charge it to that potential, or for connecting said capacitor (b) to an electrode of said transistor (c) to cause it to conduct.

Claim 14

Dependent Claim 17 words

a cap circuit plug for connecting said plurality of blasting caps in series with said rectifier 3,

Claim 15

Dependent Claim 17 words

a cap circuit plug for connecting said plurality of blasting caps in series with said rectifier 3,

Claim 16

Dependent Claim 15 words

a first switch for alternatively completing said first 2 or said second 5 circuit means,

Claim 17

Dependent Claim 15 words

a first switch for alternatively completing said first 2 or said second 5 circuit means,

Claim 18

Dependent Claim 14 words

means for applying a potential to said control electrode of said rectifier 3 comprising

Claim 19

Dependent Claim 14 words

means for applying a potential to said control electrode of said rectifier 3 comprising

Claim 20

Dependent Claim 4 words

a low voltage source,

Claim 21

Dependent Claim 4 words

a low voltage source,

Claim 22

Dependent Claim 19 words

a unijunction transistor having an electrode and being connected across said source 8 and including a series resistor therewith,

Claim 23

Dependent Claim 19 words

a unijunction transistor having an electrode and being connected across said source 8 and including a series resistor therewith,

Claim 24

Dependent Claim 20 words

third circuit means for connecting said control electrode of said rectifier 3 to one end of said series resistor 9,

Claim 25

Dependent Claim 20 words

third circuit means for connecting said control electrode of said rectifier 3 to one end of said series resistor 9,

Claim 26

Dependent Claim 3 words

a second capacitor,

Claim 27

Dependent Claim 3 words

a second capacitor,

Claim 28

Dependent Claim 14 words

fourth circuit means for connecting said second capacitor 11 to said unijunction electrode 9,

Claim 29

Dependent Claim 14 words

fourth circuit means for connecting said second capacitor 11 to said unijunction electrode 9,

Claim 30

Dependent Claim 17 words

fifth circuit means for connecting said second capacitor 11 across said source 8 for charging same, and

Claim 31

Dependent Claim 17 words

fifth circuit means for connecting said second capacitor 11 across said source 8 for charging same, and

Claim 32

Dependent Claim 47 words

a second switch for alternatively completing said fourth 12 or said fifth 13 circuit means whereby application of said potential 7 will trigger said rectifier 3 and discharge said shooting capacitor 1 when said first switch 6 is in position to complete said second circuit means 5.

Claim 33

Dependent Claim 47 words

a second switch for alternatively completing said fourth 12 or said fifth 13 circuit means whereby application of said potential 7 will trigger said rectifier 3 and discharge said shooting capacitor 1 when said first switch 6 is in position to complete said second circuit means 5.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-04-21	1978-10-21	1979-04-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-04-21	1982-10-21	1983-04-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-04-21	1986-10-21	1987-04-22	$7700.00	Window Closed / Lapsed

Seismic blaster circuit

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag