US3688292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog telemetry system having frequency signal transmission
Assignee: Robertshaw Controls Co
•
Filing: 1970-02-16
•
Granted: 1972-08-29
•
Expires: 1990-02-16
Abstract
Abstract An analog telemetry system including a plurality of analog encoders at a plurality of remote stations for sensing a plurality of different conditions and providing analog signals corresponding thereto with matching electrical characteristics. Each of the remote stations has a transmitter for transmitting the analog signals to a central control station which includes an indicating meter having a temperature scale and a graduated 0-100 scale for visually representing all of the analog signals regardless of the conditions sensed.
Inventors
- 👤 Hugh V Snively
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:15
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; H; H04; H04Q; H04Q9/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
207 words
An analog telemetry system comprising a plurality of remote stations, each of said remote stations comprising a plurality of analog encoder means each sensing a separate condition and generating an analog signal corresponding to said sensed condition, each analog encoder means having conversion means for converting the electrical characteristics of each said analog signal to match the electrical characteristics of the other analog signals and lying within a predetermined analog signal range, means adapted to selectively enable one of said analog encoder means, and transmitter means connected with each of said analog encoder means to transmit signals from said analog encoder means having said matched electrical characteristics and lying within said analog signal range over a single frequency channel; and a central control station communicating with said plurality of remote stations, said central control station comprising means to select one of said analog encoder means at one of said plurality of remote stations, receiver means for receiving said analog signals from said transmitter means over said single frequency channel, and a single indicating meter means connected with said receiver means and having an operating range corresponding to said predetermined analog signal range to visually represent any of said sensed conditions in accordance with said received analog signal.
Claim 2
Dependent Claim
207 words
An analog telemetry system comprising a plurality of remote stations, each of said remote stations comprising a plurality of analog encoder means each sensing a separate condition and generating an analog signal corresponding to said sensed condition, each analog encoder means having conversion means for converting the electrical characteristics of each said analog signal to match the electrical characteristics of the other analog signals and lying within a predetermined analog signal range, means adapted to selectively enable one of said analog encoder means, and transmitter means connected with each of said analog encoder means to transmit signals from said analog encoder means having said matched electrical characteristics and lying within said analog signal range over a single frequency channel; and a central control station communicating with said plurality of remote stations, said central control station comprising means to select one of said analog encoder means at one of said plurality of remote stations, receiver means for receiving said analog signals from said transmitter means over said single frequency channel, and a single indicating meter means connected with said receiver means and having an operating range corresponding to said predetermined analog signal range to visually represent any of said sensed conditions in accordance with said received analog signal.
Claim 3
Dependent Claim
63 words
The invention as recited in claim 1 wherein said central control station further comprises current source means, switch means connecting said current source means with said meter, and means in said receiver means responsive to transmission of said analog signals by said transmitter means to open said switch means to interrupt the supply of current from said current source means to said meter.
Claim 4
Dependent Claim
83 words
The invention as recited in claim 1 wherein said central control station further comprises a plurality of local points having analog encoder means each sensing a separate local condition and generating an analog signal corresponding to said sensed condition, each local analog encoder means having electrical characteristics matching the electrical characteristics of said remote analog signals, said local analog encoder means having output means connected with said meter to enable visual representation of said local conditions in accordance with said local analog signals.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |