Patent US4455528A successfully refreshed from Google Patents.
US4455528A
Expired / Lapsed
US
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Oscillator coil sensing head for contactless inductive proximity switch
Assignee: Siemens AG
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Filing: 1981-07-20
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Granted: 1984-06-19
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Expires: 2001-07-20
Abstract
Abstract A contactless inductive proximity switch contains an oscillator which is formed of a parallel arrangement of an oscillator coil and an oscillator capacitor connected to an integrated circuit. The oscillator coil is provided with a relatively few number of wire turns so as to occupy a relatively small portion of the volume in the cup core. The capacity of the oscillator capacitor is selected to match the oscillator coil. A hard water is retained within the cup core by a casting resin, and protects the oscillator coil from damage.
Inventors
- 👤 Heinz Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:01
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/9505
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
An oscillator circuit with a cup core sensing head, comprising: oscillator coil means contained within the cup core, said oscillator coil means having a predetermined number of wire turns so as to occupy only a relatively small portion of a volume in the cup core; oscillator capacitor means having a predetermined capacity and connected to said oscillator coil means for forming a resonant LC oscillator timing circuit; washer means disposed within the cup core and outward of said oscillator coil means; and integrated circuit means connected to said oscillator coil means and said oscillator capacitor means for producing an electronic phase reversal.
Claim 2
Dependent Claim
102 words
An oscillator circuit with a cup core sensing head, comprising: oscillator coil means contained within the cup core, said oscillator coil means having a predetermined number of wire turns so as to occupy only a relatively small portion of a volume in the cup core; oscillator capacitor means having a predetermined capacity and connected to said oscillator coil means for forming a resonant LC oscillator timing circuit; washer means disposed within the cup core and outward of said oscillator coil means; and integrated circuit means connected to said oscillator coil means and said oscillator capacitor means for producing an electronic phase reversal.
Claim 3
Dependent Claim
23 words
The oscillator circuit of claim 1 wherein there is further provided casting resin means for securing said washer means within the cup core.
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) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |