US3886369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state gating circuit for cross-point switching
Assignee: Sippican Corp
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Filing: 1974-02-11
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Granted: 1975-05-27
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Expires: 1994-02-11
Abstract
Abstract A solid-state gating circuit used as a cross-point switch for opening a signal circuit in a telephone network is disclosed. The gating circuit includes a light emitting diode connected in series with an isolation diode, and a by-pass path coupled to a point between the light emitting diode and the isolation diode. When a voltage pulse is applied through the light emitting diode, means in the by-pass path cause the isolation diode to be reverse-biased, thereby causing current to flow from the light emitting diode through the by-pass path instead of through the isolation diode. As current flows through the light emitting diode, light therefrom causes a photo-sensitive transistor in the signal circuit to conduct, thereby closing the signal circuit to permit electrical information to pass therethrough with minimal interference from spurious signals developed in the telephone network.
Inventors
- 👤 Virgle E Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:06
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/795; H03K17/7955
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
A gating circuit comprising: control means, having circuit isolation means and light emitting means for producing light energy when current passes through said light emitting means; a by-pass path, having first photo-sensitive switching means disposed in optical relationship with said light emitting means for energizing said circuit isolation means upon receipt of light energy from said light emitting means; said circuit isolation means, upon energization, causing current passing through said light emitting means to be divertEd to said by-pass path; and signal circuit means, electrically isolated from said control means, and said by-pass means, having second photosensitive switching means disposed in optical relationship with said light emitting means for electrically closing said signal circuit means upon receipt of said light energy from said light emitting means.
Claim 2
Dependent Claim
126 words
A gating circuit comprising: control means, having circuit isolation means and light emitting means for producing light energy when current passes through said light emitting means; a by-pass path, having first photo-sensitive switching means disposed in optical relationship with said light emitting means for energizing said circuit isolation means upon receipt of light energy from said light emitting means; said circuit isolation means, upon energization, causing current passing through said light emitting means to be divertEd to said by-pass path; and signal circuit means, electrically isolated from said control means, and said by-pass means, having second photosensitive switching means disposed in optical relationship with said light emitting means for electrically closing said signal circuit means upon receipt of said light energy from said light emitting means.
Claim 3
Dependent Claim
17 words
The gating circuit set forth in claim 1 wherein said circuit isolation means is a solid-state diode.
Claim 4
Dependent Claim
20 words
The gating circuit set forth in claim 1 wherein said light emitting means include at least one light emitting diode.
Claim 5
Dependent Claim
18 words
The gating circuit set forth in claim 1 wherein said first photo-sensitive switching means is a photo-sensitive transistor.
Claim 6
Dependent Claim
18 words
The gating circuit set forth in claim 1 wherein said second photo-sensitive switching means includes a photo-sensitive transistor.
Claim 7
Dependent Claim
28 words
The gating circuit set forth in claim 5 wherein said first photo-sensitive switching means further include a transistor, coupled to said photo-sensitive transistor to form a Darlington pair.
Claim 8
Dependent Claim
161 words
A gating circuit comprising: control means, having an isolation diode and a light emitting diode for producing light energy when current passes therethrough; an electrical conductor, susceptible to receiving spurious signals, coupled through said circuit isolation means to said light emitting means; a by-pass path, having a first photo-sensitive transistor disposed in optical relationship with said light emitting diode for energizing said isolation diode upon receipt of light energy from said light emitting diode; said isolation diode, upon energization, causing current passing through said light emitting diode to be diverted to said by-pass path; and a signal circuit, electrically isolated from said control means, said by-pass path and said electrical conductor, having a second photo-sensitive transistor disposed in optical relationship with said light emitting diode for electrically closing said signal circuit upon receipt of said light energy from said light emitting diode, whereby said light emitting means are electrically isolated from said electrical conductor upon energization of said circuit isolation means.
Claim 9
Dependent Claim
161 words
A gating circuit comprising: control means, having an isolation diode and a light emitting diode for producing light energy when current passes therethrough; an electrical conductor, susceptible to receiving spurious signals, coupled through said circuit isolation means to said light emitting means; a by-pass path, having a first photo-sensitive transistor disposed in optical relationship with said light emitting diode for energizing said isolation diode upon receipt of light energy from said light emitting diode; said isolation diode, upon energization, causing current passing through said light emitting diode to be diverted to said by-pass path; and a signal circuit, electrically isolated from said control means, said by-pass path and said electrical conductor, having a second photo-sensitive transistor disposed in optical relationship with said light emitting diode for electrically closing said signal circuit upon receipt of said light energy from said light emitting diode, whereby said light emitting means are electrically isolated from said electrical conductor upon energization of said circuit isolation means.
Claim 10
Dependent Claim
27 words
The gating circuit set forth in claim 7 wherein said by-pass path further includes a transistor, coupled to said first photo-sensitive transistor to form a Darlington pair.
Claim 11
Dependent Claim
158 words
A cross-point for use in a telephone switching circuit comprising: a control path having circuit isolation means and light emitting means for producing light energy when current passes through said light emitting means; an electrical conductor, susceptible to receiving spurious signals, adapted to pass current through said control path upon receipt of a control signal; a by-pass path having first photo-sensitive switching means disposed in optical relationship with said light emitting means for energizing said circuit isolation means; said circuit isolation means, upon energization, blocking current flow therethrough; a signal path, electrically isolated from said control path, said by-pass path and said electrical conductor, having second photo-sensitive switching means disposed in optical relationship with said light emitting means for electrically closing said signal path upon receipt of said light energy from said light emitting means; and a voltage source coupled to said by-pass path, for passing current through said light emitting means upon termination of said control signal.
Claim 12
Dependent Claim
158 words
A cross-point for use in a telephone switching circuit comprising: a control path having circuit isolation means and light emitting means for producing light energy when current passes through said light emitting means; an electrical conductor, susceptible to receiving spurious signals, adapted to pass current through said control path upon receipt of a control signal; a by-pass path having first photo-sensitive switching means disposed in optical relationship with said light emitting means for energizing said circuit isolation means; said circuit isolation means, upon energization, blocking current flow therethrough; a signal path, electrically isolated from said control path, said by-pass path and said electrical conductor, having second photo-sensitive switching means disposed in optical relationship with said light emitting means for electrically closing said signal path upon receipt of said light energy from said light emitting means; and a voltage source coupled to said by-pass path, for passing current through said light emitting means upon termination of said control signal.
Claim 13
Dependent Claim
15 words
The cross-point set forth in claim 9 wherein said circuit isolation means is a diode.
Claim 14
Dependent Claim
19 words
The cross-point set forth in claim 9 wherein said light emitting means include at least one light emitting diode.
Claim 15
Dependent Claim
17 words
The cross-point set forth in claim 9 wherein said second photo-sensitive switching means is a photo-sensitive transistor.
Claim 16
Dependent Claim
17 words
The cross-point set forth in claim 9 wherein said first photo-sensitive switching means includes a photo-sensitive transistor.
Claim 17
Dependent Claim
27 words
The cross-point set forth in claim 13 wherein said first photo-sensitive switching means further include a transistor, coupled to said photo-sensitive transistor to form a Darlington pair.
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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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |