Patent US3777180A successfully refreshed from Google Patents.
US3777180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal-sequence control circuit
Assignee: Cooper Industries LLC
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Filing: 1972-04-27
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Granted: 1973-12-04
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Expires: 1992-04-27
Abstract
Abstract A circuit for receiving two signals indicating occupancy of an automobile seat and fastening of the associated seat belt, and operative to generate an output signal in response to either (1) the presence of only one signal or the other, or (2) the occurrence of both signals in an improper sequence.
Inventors
- 👤 P Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:03
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18; G08B21/22; B; B60; B60R; B60R22/00; B60R22/48; B60R2022/4808; B60R2022/4816; B60R2022/4858
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
91 words
A signal-sequence control circuit comprising: 1. first means operative to receive first and second signals and to produce a first output in the absence of both said first and second signals or after receiving both said first and second signals, said first means being further operative to produce a second output after receiving either said first signal alone or said second signal alone; and 2. second means operative to prevent said first means from producing said first output whenever said first means has received said second signal before said first signal.
Claim 2
Dependent Claim
91 words
A signal-sequence control circuit comprising: 1. first means operative to receive first and second signals and to produce a first output in the absence of both said first and second signals or after receiving both said first and second signals, said first means being further operative to produce a second output after receiving either said first signal alone or said second signal alone; and 2. second means operative to prevent said first means from producing said first output whenever said first means has received said second signal before said first signal.
Claim 3
Dependent Claim
26 words
second means operative to prevent said first means from producing said first output whenever said first means has received said second signal before said first signal.
Claim 4
Dependent Claim
26 words
second means operative to prevent said first means from producing said first output whenever said first means has received said second signal before said first signal.
Claim 5
Dependent Claim
13 words
A signal-sequence control circuit according to claim 1 wherein said first means comprises:
Claim 6
Dependent Claim
21 words
second transistor means operative to change conductivity state in response to a change in conductivity state of said first transistor means;
Claim 7
Dependent Claim
21 words
second transistor means operative to change conductivity state in response to a change in conductivity state of said first transistor means;
Claim 8
Dependent Claim
39 words
connecting means operAtive to close a current path between output terminals of said first and second transistor means in the absence of said second signal, and further operative to open said current path after receiving said second signal; and
Claim 9
Dependent Claim
39 words
connecting means operAtive to close a current path between output terminals of said first and second transistor means in the absence of said second signal, and further operative to open said current path after receiving said second signal; and
Claim 10
Dependent Claim
34 words
A signal-sequence control circuit according to claim 2 wherein said connecting means comprises a switch, a first resistance, and a diode connected in series between output terminals and said first and second transistor means.
Claim 11
Dependent Claim
29 words
A signal-sequence control circuit according to claim 3 wherein the input terminal of said third transistor means is connected to the junction of said diode and said first resistance.
Claim 12
Dependent Claim
24 words
third transistor means connected to said first and second transistor means by said connecting means and operative to produce said first and second outputs.
Claim 13
Dependent Claim
24 words
third transistor means connected to said first and second transistor means by said connecting means and operative to produce said first and second outputs.
Claim 14
Dependent Claim
32 words
A signal-sequence control circuit according to claim 2 wherein the output terminal of said first transistor means is connected through a second resistance to the input terminal of said second transistor means.
Claim 15
Dependent Claim
23 words
A signal-sequence control circuit according to claim 2 further comprising a coupling circuit connected to the input terminal of said first transistor means.
Claim 16
Dependent Claim
45 words
A signal-sequence control circuit according to claim 2 wherein said second means comprises fourth transistor means operative, after only said second signal has been received by said first circuit means, to shunt any subsequent first signal from the input terminal of said first transistor means.
Claim 17
Dependent Claim
27 words
A signal-sequence control circuit according to claim 7 wherein said fourth transistor means includes bias circuit means connected between the output terminals of said first transistor means.
Claim 18
Dependent Claim
39 words
A signal-sequence control circuit according to claim 8 wherein said bias circuit means comprises a voltage breakdown device connected in series with a third resistance, the junction thereof being connected to the input terminal of said fourth transistor means.
Claim 19
Dependent Claim
18 words
A signal-sequence control circuit according to claim 9 wherein said voltage breakdown device consists of a zener diode.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |