US3670245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic clip
Assignee: HP Inc
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Filing: 1970-03-05
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Granted: 1972-06-13
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Expires: 1990-03-05
Abstract
Abstract A device which clips onto dual in-line integrated circuit (referred to herein as I.C.) package has a visual indicator for each pin or lead on the I.C. package to indicate the logic state on each pin or lead, and the device determines which leads are connected to the power supply and ground and uses the voltage across those leads to power itself.
Inventors
- 👤 Gary B Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/165; G01R19/16533; G01R19/16557
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A signalling apparatus comprising: a plurality of inputs; a reference signal bus; gating means connected to each input and to the reference signal bus for connecting an input having a potential extremum applied thereto to the reference signal bus to support current flow between the reference signal bus and the input to which the potential extremum is applied, the gating means comprising a plurality of diodes, each diode having a cathode electrode connected to a different input and an anode electrode connected to the reference signal bus; and indicating means connected to each input and to the reference signal bus for indicating the signal level on each input with respect to the signal level on the reference signal bus, the indicating means including a plurality of optical signalling devices; first circuit means for connecting each optical signalling device to a different input; and second circuit means for connecting each optical signalling device to the reference signal bus; each optical signalling device giving an optical signal in response to the signal level on the corresponding input exceeding a predetermined threshold value.
Claim 2
Dependent Claim
180 words
A signalling apparatus comprising: a plurality of inputs; a reference signal bus; gating means connected to each input and to the reference signal bus for connecting an input having a potential extremum applied thereto to the reference signal bus to support current flow between the reference signal bus and the input to which the potential extremum is applied, the gating means comprising a plurality of diodes, each diode having a cathode electrode connected to a different input and an anode electrode connected to the reference signal bus; and indicating means connected to each input and to the reference signal bus for indicating the signal level on each input with respect to the signal level on the reference signal bus, the indicating means including a plurality of optical signalling devices; first circuit means for connecting each optical signalling device to a different input; and second circuit means for connecting each optical signalling device to the reference signal bus; each optical signalling device giving an optical signal in response to the signal level on the corresponding input exceeding a predetermined threshold value.
Claim 3
Dependent Claim
151 words
A signalling apparatus comprising: a supply bus; a plurality of inputs; a reference signal bus; gating means connected to each input and to the reference signal bus for connecting an input having a lower potential extremum applied thereto to the reference signal bus to support current flow between the reference signal bus and the input to which the lower potential extremum is applied, and connected to the supply bus for connecting an input having a higher potential extremum applied thereto to the supply bus to support current flow between the supply bus and the input to which the higher potential extremum is applied; and indicating means connected to each input and to the reference signal bus for indicating the signal level on each input with respect to the signal level on the reference signal bus, the supply bus being connected to the indicating means for supplying current to the indicating means.
Claim 4
Dependent Claim
151 words
A signalling apparatus comprising: a supply bus; a plurality of inputs; a reference signal bus; gating means connected to each input and to the reference signal bus for connecting an input having a lower potential extremum applied thereto to the reference signal bus to support current flow between the reference signal bus and the input to which the lower potential extremum is applied, and connected to the supply bus for connecting an input having a higher potential extremum applied thereto to the supply bus to support current flow between the supply bus and the input to which the higher potential extremum is applied; and indicating means connected to each input and to the reference signal bus for indicating the signal level on each input with respect to the signal level on the reference signal bus, the supply bus being connected to the indicating means for supplying current to the indicating means.
Claim 5
Dependent Claim
71 words
A signalling apparatus as in claim 2 wherein: the gating means comprises a first and second plurality of diodes, each of the first plurality of diodes having a cathode electrode connected to a different input and an anode electrode connected to the reference signal bus and each of the second plurality of diodes having an anode electrode connected to a different input and a cathode electrode connected to the supply bus.
Claim 6
Dependent Claim
152 words
A signalling apparatus as in claim 3 wherein the indicating means comprises: a threshold detector for each input, comprising an amplifier having an input connected to one of the plurality of inputs, and having an output which acts as a current source when its input is above a predetermined potential and acts as a current sink when its input is below a predetermined potential; a driver amplifier for each input comprising an amplifier having an input connected to the threshold detector output, and having an output which acts as a current sink when current flows into its input and acts as an open circuit when no current flows into its input; a light emitting device for each inpuT, each device being connected to the supply bus and the output of a driver amplifier for emitting light when the driver amplifier output acts as a current sink and for emitting no light otherwise.
Claim 7
Dependent Claim
54 words
A signalling apparatus as in claim 4 wherein: the inputs are physically disposed to electrically and mechanically connect to the corresponding conductors of an integrated circuit package; and the light emitting devices are physically arranged in a pattern which bears a direct relationship to the physical arrangement of the leads of the integrated circuit.
Claim 8
Dependent Claim
25 words
A signalling apparatus as in claim 5 wherein the output of the threshold detector acts as a current source when its input is open circuited.
Claim 9
Dependent Claim
16 words
A signalling apparatus as in claim 6 wherein the light emitting devices are light emitting diodes.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |