Patent US3869648A successfully refreshed from Google Patents.
US3869648A
Expired / Lapsed
US
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Suppressor of fast high power electrical transients
Assignee: United States Department of the Navy
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Filing: 1973-10-19
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Granted: 1975-03-04
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Expires: 1993-10-19
Abstract
Abstract This invention relates to two embodiments for protecting sensitive electrical devices from fast, high power transients. One embodiment utilizes a Shockley diode and the other an SCR, both being light activated.
Inventors
- 👤 Bernard Zendle
- 👤 Marcella C Petree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:38
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/0061; H02H1/0069; H02H9/00; H02H9/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A circuit for suppressing transient signals between an input and an output comprising: a spark gap connected between said input and a ground potential; means for delaying said transients signals connected between said input and said output; light activated semiconductor means connected to said output and physically positioned to accept light produced by said spark gap for conducting said transient signals which produce a forward bias across said light activated semiconductor means to said ground potential whenever said transient signals have sufficient magnitude to activate said spark gap; means connected between said light activated semiconductor means and said ground potential for producing a predetermined reverse bias level on said light activated semiconductor means to cause said light activated semiconductor means to insulate said transient signals from said ground potential until the magnitude of said transient signals falls below said predetermined reverse bias level.
Claim 2
Dependent Claim
143 words
A circuit for suppressing transient signals between an input and an output comprising: a spark gap connected between said input and a ground potential; means for delaying said transients signals connected between said input and said output; light activated semiconductor means connected to said output and physically positioned to accept light produced by said spark gap for conducting said transient signals which produce a forward bias across said light activated semiconductor means to said ground potential whenever said transient signals have sufficient magnitude to activate said spark gap; means connected between said light activated semiconductor means and said ground potential for producing a predetermined reverse bias level on said light activated semiconductor means to cause said light activated semiconductor means to insulate said transient signals from said ground potential until the magnitude of said transient signals falls below said predetermined reverse bias level.
Claim 3
Dependent Claim
19 words
The circuit of claim 1 wherein said light activated semiconductor means comprises at least one light activated shockley diode.
Claim 4
Dependent Claim
20 words
The circuit of claim 1 wherein said light activated semiconductor means comprises at least one light activated silicon controlled rectifier.
Claim 5
Dependent Claim
25 words
The circuit of claim 2 comprising two light activated semiconductor devices arranged in a parallel opposed relationship for protection from both positive and negative transients.
Claim 6
Dependent Claim
25 words
The circuit of claim 3 comprising two light activated semiconductor devices arranged in a parallel opposed relationship for protection of both positive and negative transients.
Claim 7
Dependent Claim
24 words
The circuit of claim 1 wherein said means connected to said light activated semiconductor comprises a zener diode connected in parallel with a capacitor.
Claim 8
Dependent Claim
25 words
The device of claim 4 wherein said means connected between said light activated semiconductor means comprises a zener diode connected in parallel with a capacitor.
References Cited (Backward Citations)
US3648110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |