Patent US3770020A successfully refreshed from Google Patents.
US3770020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interface detector
Assignee: Tokyo Keiki Inc
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Filing: 1972-05-02
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Granted: 1973-11-06
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Expires: 1992-05-02
Abstract
Abstract An interface detector having a common supply pipe through which different kinds of liquids are supplied, at least two detecting devices mounted on the pipe, at least two electric circuits supplied with signals from the detecting devices and delivering corresponding signals, and electric circuits connected to be supplied with the corresponding signals from the first mentioned electric circuits and generating output signals.
Inventors
- 👤 K Tamura
- 👤 S Matsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:51
CPC Classifications
F; F17; F17D; F17D3/00; F17D3/03; F17D3/05; G; G01; G01N; G01N29/00; G01N29/02; G01N29/024; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7761; Y10T137/9682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
An interface detector comprising a common supply pipe through which different kinds of liquids are supplied, at least two detecting means mounted on said pipe, at least two electric circuits supplied with signals from said detecting means and delivering corresponding signals, and a circuit means supplied with said corresponding signals from said electric circuits and generating signals.
Claim 2
Dependent Claim
57 words
An interface detector comprising a common supply pipe through which different kinds of liquids are supplied, at least two detecting means mounted on said pipe, at least two electric circuits supplied with signals from said detecting means and delivering corresponding signals, and a circuit means supplied with said corresponding signals from said electric circuits and generating signals.
Claim 3
Dependent Claim
23 words
An interface detector as claimed in claim 1 in which said at least two detecting means are two detecting means of same kind.
Claim 4
Dependent Claim
21 words
An interface detector as claimed in claim 2 in which said detecting means consist of ultrasonic wave transmitting and receiving elements.
Claim 5
Dependent Claim
78 words
An interface detector as claimed in claim 1 in which said two detecting means are different in kind and said circuit means includes two OR-circuits supplied with output signals from one of said electric circuits and four AND-circuits supplied with output signals from the other of said electric circuits, an output signal from one of said OR-circuits being supplied to two of said four AND-circuits, while output signal from the remaining OR-circuit being supplied to the remaining AND-circuits.
Claim 6
Dependent Claim
64 words
An interface detector as claimed in claim 4 further includes another set of a similar circuit system defined in claim 4, in which the detecting elements of said another set of circuit systems are mounted on said pipe spaced from the detecting elements of said first-mentioned circuit system and output signal from said two sets of circuit systems are applied to a logical circuit.
Claim 7
Dependent Claim
35 words
An interface detector as claimed in claim 5 in which an output signal from said last-mentioned logical circuit is employed through an electric circuit to control a valve inserted into said pipe at its outlet.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |