USRE27044E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-tone remote control system
Assignee: —
•
Filing: 1968-11-18
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Granted: 1971-02-02
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Expires: 1988-11-18
Abstract
Abstract A SYSTEM IS DISCLOSED FOR CONTROLLING THE BLOWING OF A WHISTLE EMPLOYED IN LOGGING OPERATIONS FROM A DISTANCE BY RADIO CONTROL. A TRANSMITTER SENDS AND A RECEIVER RESPONDS TO A CARRIER FREQUENCY MODULATED BY A BURST OF A FIRST AUDIO FREQUENCY TONE OF LIMITED DURATION FOLLOWED IMMEDIATELY BY A SECOND AUDIO FREQUENCY TONE MODULATION OF INDEFINITE DURATION. THE BURST OF FIRST FREQUENCY MODULATION IS SUFFICIENTLY SHORT THAT RECEIVERS OF CONVENTIONAL SINGLE TONE MODULATION SYSTEMS WILL NOT RESPOND.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:36
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/022; H04W88/00; H04W88/18; H04W88/185; H04W88/188
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |