US3899698A
Expired / Lapsed
US
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Piezoelectric key
Assignee: Siemens AG
•
Filing: 1974-03-18
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Granted: 1975-08-12
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Expires: 1994-03-18
Abstract
Abstract A piezoelectric key for actuation by an attentionally directed and dimensioned compressive force includes a piezoelectric transducer for controlling an electrical amplifier element of an electronic circuit. The body of the transducer includes a directionally and permanently polarized piezoelectric material having electrodes situated thereon for taking off an electrical voltage. The body, in each plane perpendicular to the direction of the compressive force, has an approximately constant cross section and a thickness dimension d which is small with respect to another dimension of the body, the body being polarized in the direction of its thickness d. The electrodes are applied to the surfaces of the body which pulls each other in the direction d and the body is arranged in the key in such a way that the dimension d is essentially aligned perpendicular to the direction of application of the compressive force. The body is polarized throughout its volume and a dimension l (corresponding to length or circumference) which is essentially perpendicular to the thickness and to the direction of application of the compressive force is dimensioned several times greater than the dimension d, and the body has a dimension h which is perpendicular with respect to the dimensions d and l and which is larger than approximately ten times the dimension d.
Inventors
- 👤 Peter Kleinschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/964
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
173 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, and the height h is perpendicular to the thickness d and the length l and is greater than 10d.
Claim 2
Dependent Claim
173 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, and the height h is perpendicular to the thickness d and the length l and is greater than 10d.
Claim 3
Dependent Claim
23 words
The key of claim 1, wherein said body includes a base surface having an area l . d of less than 5 mm2.
Claim 4
Dependent Claim
18 words
The key of claim 2, wherein said base surface has an area of < or = 1 mm2.
Claim 5
Dependent Claim
13 words
The key of claim 1, wherein the length l is at least 20d.
Claim 6
Dependent Claim
11 words
The key of claim 1, wherein the length l is 50d.
Claim 7
Dependent Claim
19 words
The key of claim 1, wherein the length l is in a range of from 5 to 20 mm.
Claim 8
Dependent Claim
72 words
The key of claim 1, wherein the length l is dimensioned according to the equation l n. g31 . K/U where K is the compressive force acting upon the surface l . d of said body, g31 is the piezoelectric voltage constant of the material of said body, U is the response voltage necessary foR actuating the electronic circuit and n is a value in a range of from 0.3 to 2.0.
Claim 9
Dependent Claim
14 words
The key of claim 1, wherein the thickness d is less than 0.5 mm.
Claim 10
Dependent Claim
19 words
The key of claim 1, wherein the thickness d is in a range of from 0.05 to 0.15 mm.
Claim 11
Dependent Claim
28 words
The key of claim 1, wherein said body includes surface areas defined by the dimensions l . h and said electrodes cover respective ones of such surface areas.
Claim 12
Dependent Claim
196 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d is at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and support means mounted against said body and co-operable therewith to resist bending in response to the application of the intentionally applied compressive force.
Claim 13
Dependent Claim
196 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d is at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and support means mounted against said body and co-operable therewith to resist bending in response to the application of the intentionally applied compressive force.
Claim 14
Dependent Claim
34 words
The key of claim 11, wherein said support means, in the direction of the force, has an integral pressure elastic resilience which is substantially the same as to greater than that of said body.
Claim 15
Dependent Claim
21 words
The key of claim 11, wherein said support means comprises a pair of plates fixed to opposite surfaces of said body.
Claim 16
Dependent Claim
30 words
The key of claim 11, wherein said support means comprises a member embedding said body and having an X-shaped profile in the direction parallel to the direction of force application.
Claim 17
Dependent Claim
26 words
The key of claim 13, wherein each of said plates has dimensions corresponding to the corresponding dimensions of the respective surface on which it is fixed.
Claim 18
Dependent Claim
37 words
The key of claim 15, wherein each of said plates has a thickness which provides the bending resistance and an integral pressure elastic resilience greater than that of said body in the direction of the applied force.
Claim 19
Dependent Claim
19 words
The key of claim 13, wherein said plates are mounted on the two largest lateral surfaces of said body.
Claim 20
Dependent Claim
13 words
The key of claim 13, wherein said plates are bonded to said body.
Claim 21
Dependent Claim
12 words
The key of claim 13, wherein said plates consist of synthetic material.
Claim 22
Dependent Claim
24 words
The key of claim 11, wherein said housing includes a force transmission member, mounting said body only in a small zone of said body.
Claim 23
Dependent Claim
25 words
The key of claim 20, wherein said housing includes external surfaces, a force receiving member, and mounting flanges extending from said surfaces adjacent said member.
Claim 24
Dependent Claim
27 words
The key of claim 11, comprising supporting means including a pair of support plates, and thermoplastic bonding means securing said plates to opposite surfaces of said body.
Claim 25
Dependent Claim
18 words
The key of claim 22, wherein said plates include recesses for receiving respective electrical connections for said electrodes.
Claim 26
Dependent Claim
17 words
The key of claim 23, comprising conductive strips carried in said recesses and connected to the electrodes.
Claim 27
Dependent Claim
175 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said bodY for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d.l.h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and heat insulating means surrounding said body.
Claim 28
Dependent Claim
175 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said bodY for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d.l.h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and heat insulating means surrounding said body.
Claim 29
Dependent Claim
21 words
The key of claim 25, wherein said heat insulating means comprises a material which is less compression resistant than said body.
Claim 30
Dependent Claim
218 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a housing for said transducer, said housing including a base, a cover to receive the force, a body mounted between said base and said cover, and walls adjoining said base and said cover and having less compression resistance to the force than to said body.
Claim 31
Dependent Claim
218 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a housing for said transducer, said housing including a base, a cover to receive the force, a body mounted between said base and said cover, and walls adjoining said base and said cover and having less compression resistance to the force than to said body.
Claim 32
Dependent Claim
31 words
The key of claim 27, wherein said housing includes a base having a groove therein and a cover having grooved means, said body mounted in said groove and said grooved means.
Claim 33
Dependent Claim
196 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and the length l and is greater than 10d, and a housing for said transducer including a base and a cover plate mounting said body therebetween, and a plurality of side walls joining said base and said cover, said side walls being resilient with respect to the compressive force and said base being slightly resistant to bending.
Claim 34
Dependent Claim
196 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and the length l and is greater than 10d, and a housing for said transducer including a base and a cover plate mounting said body therebetween, and a plurality of side walls joining said base and said cover, said side walls being resilient with respect to the compressive force and said base being slightly resistant to bending.
Claim 35
Dependent Claim
207 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of aN intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a second electrode mounted adjacent and electrically insulated from and having the same surface as one of the first-mentioned electrodes, said body being polarized in opposite directions in the zones adjacent said adjacent electrodes.
Claim 36
Dependent Claim
207 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of aN intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a second electrode mounted adjacent and electrically insulated from and having the same surface as one of the first-mentioned electrodes, said body being polarized in opposite directions in the zones adjacent said adjacent electrodes.
Claim 37
Dependent Claim
205 words
A eky for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a housing mounting said body including means receiving a compressive force in one direction and converting the force and applying it to said body in a direction perpendicular to said one direction.
Claim 38
Dependent Claim
205 words
A eky for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a housing mounting said body including means receiving a compressive force in one direction and converting the force and applying it to said body in a direction perpendicular to said one direction.
Claim 39
Dependent Claim
197 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a second pair of electrodes mounted adjacent respective ones of the first-mentioned electrodes to form a capacitor for connection in circuit with the amplifier.
Claim 40
Dependent Claim
197 words
A key for controlling an amplifier of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and a second pair of electrodes mounted adjacent respective ones of the first-mentioned electrodes to form a capacitor for connection in circuit with the amplifier.
Claim 41
Dependent Claim
193 words
A key for controlling an amplifier Of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and said body having a total height H and including a piezoelectric portion h and a non-piezoelectric portion H - h.
Claim 42
Dependent Claim
193 words
A key for controlling an amplifier Of an electronic circuit in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and for connection to the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and said body having a total height H and including a piezoelectric portion h and a non-piezoelectric portion H - h.
Claim 43
Dependent Claim
24 words
The key of claim 33, wherein said piezoelectric portion and said nonpiezoelectric portion are a single piece, said piezoelectric portion being the polarized sub-volume.
Claim 44
Dependent Claim
21 words
The key of claim 34, comprising an actuating member and wherein said nonpiezoelectric portion H-h is mounted facing said actuating member.
Claim 45
Dependent Claim
206 words
An electronic key circuit operable in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: an amplifier, a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and connected to the input of the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and an RC filter, said body having a total height H, a second pair of electrodes mounted on opposite surfaces of said body in the zone H-h to form a capacitance of said RC filter.
Claim 46
Dependent Claim
206 words
An electronic key circuit operable in response to the application thereto of an intentionally applied and dimensioned compressive force, comprising: an amplifier, a piezoelectric transducer including a body of piezoceramic material for receiving the compressive force, a pair of electrodes on said body for taking off electrical signals and connected to the input of the amplifier, said body having a substantially constant cross section perpendicular to the compressive force, said body polarized in a direction d in at least a sub-volume (d . l . h) thereof where d is the thickness dimension, l is the length dimension, and h is the height dimension, said electrodes mounted on opposite surfaces of said body spaced apart the thickness d, the thickness d perpendicular to the direction of the compressive force, the length l being perpendicular to the thickness d and to the direction of the compressive force and is greater than the thickness d, the height h is perpendicular to the thickness d and the length l and is greater than 10d, and an RC filter, said body having a total height H, a second pair of electrodes mounted on opposite surfaces of said body in the zone H-h to form a capacitance of said RC filter.
Claim 47
Dependent Claim
48 words
The electronic key circuit of claim 36, wherein said RC filter is a low pass RC filter which comprises a resistor, said resistor defined by a strip of resistance material connecting a first-mentioned electrode and a second electrode which are mounted on the same surface of said body.
Claim 48
Dependent Claim
29 words
The electronic key circuit of claim 36, comprising a low pass RC filter connecting said body and said amplifier and operable to short circuit frequencies higher than 100 Hz.
Claim 49
Dependent Claim
29 words
The electronic key circuit of claim 38, wherein one of the first-mentioned electrodes and the second electrode which is mounted therewith on the same body surface are electrically connected.
Claim 50
Dependent Claim
28 words
The electronic key circuit of claim 38, comprising a high pass RC filter connected to said body to prevent frequencies of higher than 10 Hz from being discharged.
Claim 51
Dependent Claim
38 words
The electronic key circuit of claim 40, wherein said electrodes constitute the capacitor plates of the capacitance of high pass RC filter and said high pass RC filter includes a resistor connected across the inPut of said amplifier.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |