US5072231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrist carried wireless instrument
Assignee: Seiko Epson Corp
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Filing: 1989-03-21
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Granted: 1991-12-10
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Expires: 2009-03-21
Abstract
Abstract A wrist carried wireless instrument for minimizing the effects of coming in contact with the wrist of the user is provided. A case contains wireless instrument circuitry. A loop antenna extends without the case. An antenna resonance circuit has two capacitors connected in series. The two capacitors are connected to the loop antenna. A connection between two of the capacitors is formed at substantially the half impedance value across the capacitors and is a ground electric potential. An RF amplifier connects the loop antenna to the wireless instrument circuitry.
Inventors
- 👤 Shunsuke Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:40
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/273; H01Q7/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A wrist carried wireless instrument comprising a case for supporting wireless instrument circuitry, a loop antenna extending without said case, an antenna resonance circuit formed by said loop antenna and at least two capacitors coupled in series, an electric ground potential coupled at an essentially half impedance point of said series connected capacitors and a RF amplifier which is a front end amplifier having at least two input terminals wherein said capacitors are connected across said input terminals of said RF amplifier, said loop antenna providing a balanced input to said RF amplifier.
Claim 2
Dependent Claim
93 words
A wrist carried wireless instrument comprising a case for supporting wireless instrument circuitry, a loop antenna extending without said case, an antenna resonance circuit formed by said loop antenna and at least two capacitors coupled in series, an electric ground potential coupled at an essentially half impedance point of said series connected capacitors and a RF amplifier which is a front end amplifier having at least two input terminals wherein said capacitors are connected across said input terminals of said RF amplifier, said loop antenna providing a balanced input to said RF amplifier.
Claim 3
Dependent Claim
22 words
A wrist carried wireless instrument of claim 1, wherein said loop antenna is formed to extend about a wrist of a user.
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) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |