Patent US4123674A successfully refreshed from Google Patents.
US4123674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage peak short store system
Assignee: Snap On Inc
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Filing: 1976-08-19
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Granted: 1978-10-31
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Expires: 1996-08-19
Abstract
Abstract An improvement in an analog oscilloscope for an automotive ignition analyzer is disclosed. The improvement is a short store circuit which enables substantially complete display of the secondary coil voltage, including the peak amplitude of the firing line voltage.
Inventors
- 👤 Gary F. Comiskey
- 👤 Gregory N. Hesse
- 👤 Johannes P. Bovenlander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:35
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; F; F02; F02P; F02P17/00; F02P17/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
276 words
In a device for displaying a voltage, said voltage having a peak, an improvement comprising, in combination: voltage storage means; amplifier means for receiving said voltage and charging said voltage storage means in response thereto, said amplifier means producing a charging voltage; controllably conductive means, coupled to said voltage storage, for selectively discharging said voltage storage means, said controllably conductive means having an operative discharging state and an inoperative state; pulse generating means for receiving said voltage and generating a trigger pulse in response thereto; control means, coupled to said controllably conductive means and said pulse generating means, for controlling said controllably conductive means, said control means placing said controllably conductive means in said inoperative state in response to said trigger pulse and placing said controllably conductive means in said operative discharging state a predetermined time after entering said inoperative state, whereby said voltage storage means is charged to a potential substantially proportional to said peak prior to discharge; and controllable interconnect means, coupled to said voltage storage means and said amplifier means and responsive to said charging voltage and said potential, for connecting and disconnecting said voltage storage means and said amplifier means, said controllable interconnect means disconnecting said voltage storage means from said amplifier means prior to said operative discharging state and connecting said voltage storage means to said amplifier means after initiation of said operative discharging state whenever said potential substantially equals said charging voltage; said amplifier means, said controllably conductive means and said controllable interconnect means cooperatively defining signal following means for maintaining said potential on said voltage storage means substantially proportional to said voltage after discharge of said voltage storage means.
Claim 2
Dependent Claim
276 words
In a device for displaying a voltage, said voltage having a peak, an improvement comprising, in combination: voltage storage means; amplifier means for receiving said voltage and charging said voltage storage means in response thereto, said amplifier means producing a charging voltage; controllably conductive means, coupled to said voltage storage, for selectively discharging said voltage storage means, said controllably conductive means having an operative discharging state and an inoperative state; pulse generating means for receiving said voltage and generating a trigger pulse in response thereto; control means, coupled to said controllably conductive means and said pulse generating means, for controlling said controllably conductive means, said control means placing said controllably conductive means in said inoperative state in response to said trigger pulse and placing said controllably conductive means in said operative discharging state a predetermined time after entering said inoperative state, whereby said voltage storage means is charged to a potential substantially proportional to said peak prior to discharge; and controllable interconnect means, coupled to said voltage storage means and said amplifier means and responsive to said charging voltage and said potential, for connecting and disconnecting said voltage storage means and said amplifier means, said controllable interconnect means disconnecting said voltage storage means from said amplifier means prior to said operative discharging state and connecting said voltage storage means to said amplifier means after initiation of said operative discharging state whenever said potential substantially equals said charging voltage; said amplifier means, said controllably conductive means and said controllable interconnect means cooperatively defining signal following means for maintaining said potential on said voltage storage means substantially proportional to said voltage after discharge of said voltage storage means.
Claim 3
Dependent Claim
15 words
An improvement as claimed in claim 1 wherein said voltage storage means is a capacitor.
Claim 4
Dependent Claim
15 words
An improvement as claimed in claim 1 wherein said controllably conductive means includes a diode.
Claim 5
Dependent Claim
37 words
An improvement as claimed in claim 1 further comprising switch means for receiving said charging voltage and generating a switching signal in response thereto, said control means altering said predetermined time in response to said switching signal.
Claim 6
Dependent Claim
24 words
An improvement as claimed in claim 4 wherein said switch means includes a first transistor interconnected to said amplifier means and said control means.
Claim 7
Dependent Claim
25 words
An improvement as claimed in claim 1 wherein said control means includes a multivibrator interconnected to said pulse generating means and said controllably conductive means.
Claim 8
Dependent Claim
24 words
An improvement as claimed in claim 6 wherein said control means further includes a second transistor interposed said multivibrator and said controllably conductive means.
Claim 9
Dependent Claim
15 words
An improvement as claimed in claim 1 wherein said controllable interconnect means includes a diode.
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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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |