US3603881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency shift telemetry system with both radio and wire transmission paths
Assignee: Del Mar Engineering Laboratories
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Filing: 1968-03-01
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Granted: 1971-09-07
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Expires: 1988-03-01
Abstract
Abstract A transmission system using a possibly existing wiring system for transmitting RF signals and covering short distances away from the wiring system through VHF transmission. In hospitals, physiological data are transmitted from a sensor VHF transmitter to a fixed VHF receiver RF transmitter coupled to the wiring system in the building. A RF receiver demodulator monitor is coupled to wiring system at the nurses'' station. The system is particularly designed for noise suppression.
Inventors
- 👤 William E Thornton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:07
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/0002; A61B5/0015; A61B5/002; G; G08; G08C; G08C19/00; G08C19/16; G08C19/28; Y; Y10; Y10S; Y10S128/00; Y10S128/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A system for transmission of information using a wiring system, comprising: a first and second oscillator each providing high frequency signals of slightly differing frequencies; first means defining a source of data and providing data signals to be transmitted, the signals having characteristics of a pulse-pause train; second means connected to the oscillators for transmitting the high frequency signals and including means for connecting the oscillators to the source for obtaining short-range wireless transmission of the high frequency signals of the two oscillators in alternating sequence in accordance with the pulse-pause train; third means positioned for receiving the high frequency signals as transmitted by the second means and providing a signal train in which two frequencies alternate in accordance with said pulse-pause train, the latter two frequencies being below a limit frequency for signal transmission through the wiring system; fourth means coupling the signal train to the wiring system for transmission therethrough; and fifth means coupled to the wiring system and being responsive to the signals of the train for providing a duplicate signal of said pulse-pause train.
Claim 2
Independent Claim
178 words
A system for transmission of information using a wiring system, comprising: a first and second oscillator each providing high frequency signals of slightly differing frequencies; first means defining a source of data and providing data signals to be transmitted, the signals having characteristics of a pulse-pause train; second means connected to the oscillators for transmitting the high frequency signals and including means for connecting the oscillators to the source for obtaining short-range wireless transmission of the high frequency signals of the two oscillators in alternating sequence in accordance with the pulse-pause train; third means positioned for receiving the high frequency signals as transmitted by the second means and providing a signal train in which two frequencies alternate in accordance with said pulse-pause train, the latter two frequencies being below a limit frequency for signal transmission through the wiring system; fourth means coupling the signal train to the wiring system for transmission therethrough; and fifth means coupled to the wiring system and being responsive to the signals of the train for providing a duplicate signal of said pulse-pause train.
Claim 3
Dependent Claim
37 words
A system as set forth in claim 1, the fifth means including a pair of narrow band tuned receivers coupled to the wiring system and respectively responsive to the two frequencies as provided by the third means.
Claim 4
Dependent Claim
40 words
A system as set forth in claim 1 wherein first means including a. means for providing information signals, and b. means coupled to the (a) means to provide a subcarrier modulated by the information signals and as a pulse-pause train.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |