US4593412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated oscillator antenna for low power, low harmonic radiation
Assignee: MULTI-ELMAC Co NOVI MI A CORP OF MI
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Filing: 1984-05-21
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Granted: 1986-06-03
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Expires: 2004-05-21
Abstract
Abstract A low-power transmitter for garage door operator systems and the like wherein harmonics of the fundamental frequency are suppressed by class A or AB oscillator operation and fundamental radiation is enhanced by way of a combined inductor/radiator having conductive printed circuit extrusions on the ends thereof to effectively form a center-fed dipole antenna.
Inventors
- 👤 Keith Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:14
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
In a radio transmitter of the type which includes an oscillator having a tank circuit and an inductor in the tank circuit serving as an antenna element and having first and second ends, first and second antenna inductors each having first and second ends with the first ends of the first and second antenna inductors respectively coupled to the first and second ends of the tank circuit inductor, the second ends of the first and second antenna inductors being connected to a respective antenna conductor with an open terminal end forming a center-fed dipole antenna.
Claim 2
Dependent Claim
95 words
In a radio transmitter of the type which includes an oscillator having a tank circuit and an inductor in the tank circuit serving as an antenna element and having first and second ends, first and second antenna inductors each having first and second ends with the first ends of the first and second antenna inductors respectively coupled to the first and second ends of the tank circuit inductor, the second ends of the first and second antenna inductors being connected to a respective antenna conductor with an open terminal end forming a center-fed dipole antenna.
Claim 3
Dependent Claim
37 words
Apparatus as defined in claim 1 further including a printed circuit board, all of said antenna-conductors and at least portions of said tank circuit inductor and first and second antenna-inductors being printed on said printed circuit board.
References Cited (Backward Citations)
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Cited
US2091663A
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US3228030A
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US3651405A
Cited
US3875513A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |