US3562438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intraplant radio communication system
Assignee: Gai Tronics Corp
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Filing: 1967-09-07
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Granted: 1971-02-09
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Expires: 1987-09-07
Abstract
Abstract This invention relates to an intraplant communication system which provides, in addition to telephone communication, radio channels of communication whereby communication may be had with roving watchmen or watchengineers who carry portable transceivers. The supplementary radio communication comprises a number of portable transceivers for communication with a base or fixed transmitter and receiver connected to the paging system. Such portable transceivers are equipped with a noise canceling low impedence type transmitter microphone and a separate earphone receiver.
Inventors
- 👤 Joseph J Radomski
- 👤 Paul B Day
- 👤 Arthur H Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:57
CPC Classifications
H; H04; H04B; H04B7/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
In an intraplant voice communication system comprising a plurality of separate stations, each including a loudspeaker and associated power amplifier and power supply therefor and including a handset having a receiver, microphone and preamplifier, and a party line and page line to which said power amplifier and preamplifier are connected; the improvement comprising a page party radio line, a radio transmitter connected thereto, a radio receiver also connected thereto for providing communication between a separate transceiver and said radio receiver and intraplant voice communication system, a tape recorder which is initiated by the carrier frequency of said transceiver, and a playback unit connected to said page party radio line and which starts when said carrier frequency is turned off so that the playback message will be sent over the paging system.
Claim 2
Dependent Claim
131 words
In an intraplant voice communication system comprising a plurality of separate stations, each including a loudspeaker and associated power amplifier and power supply therefor and including a handset having a receiver, microphone and preamplifier, and a party line and page line to which said power amplifier and preamplifier are connected; the improvement comprising a page party radio line, a radio transmitter connected thereto, a radio receiver also connected thereto for providing communication between a separate transceiver and said radio receiver and intraplant voice communication system, a tape recorder which is initiated by the carrier frequency of said transceiver, and a playback unit connected to said page party radio line and which starts when said carrier frequency is turned off so that the playback message will be sent over the paging system.
Claim 3
Dependent Claim
48 words
An intraplant voice communication system as recited in claim 1, together with a storage container for receiving tape from said tape recorder and located between said recorder and playback unit, and an electrical switch responsive to the tension of said tape for controlling operation of said playback unit.
Claim 4
Dependent Claim
60 words
an intraplant voice communication system as recited in claim 1 wherein said radio transmitter is operable at a given frequency and is connected to said page party radio line through a coupler, and wherein said radio receiver is operable at a different frequency and is connected to said page party radio line through a second coupler with side tone cancellation.
Claim 5
Dependent Claim
59 words
An intraplant voice communication system as recited in claim 1 together with a storage container including two separate compartments for receiving the entire length of tape, one of said compartments serving as a storage container for a large length of tape folded back and forth therein, and a tape tension switch located in at least one of said compartments.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |