US3593048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential transducer
Assignee: LGB Inc
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Filing: 1969-12-04
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Granted: 1971-07-13
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Expires: 1989-12-04
Abstract
Abstract A transducer such as piezoelectric crystal is halved and, with one half inverted, the parts are joined together with insulation therebetween. An electrical connection is made between faces of the two halves on one side of the unit and electrical conductors extend separately from the two halves on the other side of the unit to a differential amplifier. Ambient electrical fields do not influence the output of the transducer.
Inventors
- 👤 Harold L Dunegan
- 👤 Albert E Brown
- 👤 Paul L Knauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
H; H04; H04R; H04R17/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A differential transducer comprising a piezoelectric crystal unit including two crystal pieces separated by insulation with one piece inverted with respect to the other to dispose a positive polarity surface of one piece in alignment with a negative polarity surface of the other piece as a front face of the unit, a common electrical conductor connecting the two pieces at said front face of the unit, and a pair of electrical conductors separately connected one to each crystal piece at a back face of said crystal unit.
Claim 2
Dependent Claim
87 words
A differential transducer comprising a piezoelectric crystal unit including two crystal pieces separated by insulation with one piece inverted with respect to the other to dispose a positive polarity surface of one piece in alignment with a negative polarity surface of the other piece as a front face of the unit, a common electrical conductor connecting the two pieces at said front face of the unit, and a pair of electrical conductors separately connected one to each crystal piece at a back face of said crystal unit.
Claim 3
Dependent Claim
35 words
The differential transducer of claim 1 further defined by said crystal pieces comprising separate halves of a single piezoelectric crystal, and said crystal unit comprising the two halves disposed in side-by-side relation with insulation therebetween.
Claim 4
Dependent Claim
91 words
The differential transducer of claim 1 further defined by said piezoelectric crystal unit comprising two halves of a single crystal having flat front and back surfaces and one half being inverted to dispose thE back surface thereof in alignment beside the front surface of the other half of the crystal unit as a back face of the crystal unit, said insulation joining together said crystal halves, and said common conductor comprising an electrically conducting layer extending across the front face of the crystal unit in electrical contact with both crystal halves.
Claim 5
Dependent Claim
114 words
A differential transducer comprising a piezoelectric crystal unit including two crystal pieces separated by insulation with one piece inverted with respect to the other to dispose a positive polarity surface of one piece in alignment with a negative polarity surface of the other piece as a front face of the unit, a common electrical conductor connecting the two pieces at said front face of the unit, a pair of electrical conductors separately connected one to each crystal piece at a back face of said crystal unit, a differential amplifier having a pair of inputs, connecting means connecting said pair of conductors to said inputs, and indicating means connected to the output of said amplifier.
Claim 6
Dependent Claim
114 words
A differential transducer comprising a piezoelectric crystal unit including two crystal pieces separated by insulation with one piece inverted with respect to the other to dispose a positive polarity surface of one piece in alignment with a negative polarity surface of the other piece as a front face of the unit, a common electrical conductor connecting the two pieces at said front face of the unit, a pair of electrical conductors separately connected one to each crystal piece at a back face of said crystal unit, a differential amplifier having a pair of inputs, connecting means connecting said pair of conductors to said inputs, and indicating means connected to the output of said amplifier.
Claim 7
Dependent Claim
42 words
The differential transducer of claim 4 further defined by said connecting means comprising a shielded two-wire line having the shield thereof extending between said common conductor and said amplifier and two wires thereof connecting said pair of conductors and said amplifier input.
References Cited (Backward Citations)
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US3150275A
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US3336807A
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US3269175A
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US3396286A
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US3311873A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |