US4500377A — Process for the production of a block of piezoele…

Claim 1

Independent Claim 175 words

Process for the production of blocks of piezoelectric macromolecular material from a thin film utilised as an element of a monolithic multilaminar structure, said process comprising the steps of: (a) cutting said film into a strip of uniform width; (b) drawing said strip off a feed reel; (c) conveying the strip, drawn off said feed reel according to step (b), to a receiving mandrel and rolling the strip onto said receiving mandrel thereby forming a multiturn roll having the said width; (d) compressing the roll formed at said mandrel according to step (c) at right angles to said turns until a monolithic multilaminar structure is obtained; and (e) cutting portions from the said roll to thereby form said blocks; wherein between steps (b) and (c) there are sequentially practiced the steps of: (i) electrically polarizing the strip across its thickness; and (ii) coating the strip electrically polarized according to step (i) with an adhesive on at least one surface of said strip by contacting said strip with a solution of said adhesive in a solvent.

Claim 2

Dependent Claim 175 words

Process for the production of blocks of piezoelectric macromolecular material from a thin film utilised as an element of a monolithic multilaminar structure, said process comprising the steps of: (a) cutting said film into a strip of uniform width; (b) drawing said strip off a feed reel; (c) conveying the strip, drawn off said feed reel according to step (b), to a receiving mandrel and rolling the strip onto said receiving mandrel thereby forming a multiturn roll having the said width; (d) compressing the roll formed at said mandrel according to step (c) at right angles to said turns until a monolithic multilaminar structure is obtained; and (e) cutting portions from the said roll to thereby form said blocks; wherein between steps (b) and (c) there are sequentially practiced the steps of: (i) electrically polarizing the strip across its thickness; and (ii) coating the strip electrically polarized according to step (i) with an adhesive on at least one surface of said strip by contacting said strip with a solution of said adhesive in a solvent.

Claim 3

Dependent Claim 61 words

Process according to claim 1 wherein two strips are drawn off two feed reels and rolled at the same time on a common receiving mandrel; at least one of the said strips being electrically polarized and coated with adhesive in such a manner as to provide a means of connection between the said strips which are superposed in the said roll.

Claim 4

Dependent Claim 26 words

Process according to claim 2, wherein the connection means are rendered electrically conductive by incorporating conductive particles in the solution for the application of the adhesive.

Claim 5

Dependent Claim 12 words

Process according to claim 3, wherein the conductive particles are carbon particles.

Claim 6

Dependent Claim 43 words

Process according to claim 2, wherein the strips are provided with metallisations enflanking each of the turns of the roll, these metallisations occupying a part of the width of the roll and extending flush with the corresponding one of its two lateral surfaces.

Claim 7

Dependent Claim 23 words

Process according to any one of claims 3 to 5, wherein conductive deposits are produced on the lateral surfaces of the said roll.

Claim 8

Dependent Claim 14 words

Process according to claim 6, wherein the said conductive deposits are formed by metallisations.

Claim 9

Dependent Claim 20 words

Process according to claim 7, wherein the said conductive deposits are formed by a polymeric material charged with conductive particles.

Claim 10

Dependent Claim 21 words

Process according to claim 1 wherein the electric polarisation in depth has the same sign throughout the height of the roll.

Claim 11

Dependent Claim 33 words

Process according to claim 1 wherein the electric polarisation in depth has the same sign in a first portion of the roll and the contrary sign in a second portion of the roll.

Claim 12

Dependent Claim 18 words

Process according to claim 2, wherein the electric polarisation in depth alternates throughout the height of the roll.

Claim 13

Dependent Claim 37 words

Process according to claim 2, wherein the electric polarisation in depth alternates in two contiguous portions of the height of the roll, the alternation changing sign upon passing from one of the said portions to the other.

Claim 14

Dependent Claim 19 words

Process according to claim 2, wherein the electric polarisation in depth is obtained by means of a corona discharge.

Claim 15

Dependent Claim 23 words

Process according to claim 2, wherein the intensity of the electric polarisation in depth is modulated during the unreeling of the said strip.

Claim 16

Dependent Claim 21 words

Process according to claim 2, wherein the compression of the roll comprises an operation for forming to shape within a press.

Claim 17

Dependent Claim 22 words

Process according to claim 15 wherein the shaping operation is performed after the precompressed roll has been drawn off the said mandrel.

Claim 18

Dependent Claim 19 words

Process according to claim 16 wherein the shaping operation is applied to the portions separated from the said roll.

Claim 19

Dependent Claim 18 words

Process according to claim 16, wherein the shaping operation is applied to the whole of the said roll.

Claim 20

Dependent Claim 19 words

Process according to claim 18, wherein the shaping operation applies a pressing means acting radially on the said roll.

Claim 21

Dependent Claim 16 words

Process according to claim 18, wherein the shaping operation imparts a flattened form to the roll.

Claim 22

Dependent Claim 119 words

A process for the production of blocks of piezoelectric macromolecular material from a thin film utilized as an element of a monolithic multilaminar structure, said process comprising the sequential steps of: (a) continuously drawing a strip of the thin film from a feed reel, the strip having a predetermined width; (b) electrically polarizing the strip across its thickness; (c) coating the polarized strip on at least one surface thereof with an adhesive; (d) rolling the strip onto a receiving mandrel to form a multi-layer body while simultaneously compressing the multi-layer body at said receiving body to adhesively affix adjacent layers thereof one-to-another; and (e) sectioning a portion of said multi-layer body thereby forming a block of piezoelectric macromolecular material.

Claim 23

Dependent Claim 119 words

A process for the production of blocks of piezoelectric macromolecular material from a thin film utilized as an element of a monolithic multilaminar structure, said process comprising the sequential steps of: (a) continuously drawing a strip of the thin film from a feed reel, the strip having a predetermined width; (b) electrically polarizing the strip across its thickness; (c) coating the polarized strip on at least one surface thereof with an adhesive; (d) rolling the strip onto a receiving mandrel to form a multi-layer body while simultaneously compressing the multi-layer body at said receiving body to adhesively affix adjacent layers thereof one-to-another; and (e) sectioning a portion of said multi-layer body thereby forming a block of piezoelectric macromolecular material.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-02-19	1988-08-20	1989-02-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-02-19	1992-08-20	1993-02-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-02-19	1996-08-20	1997-02-19	$7700.00	Window Closed / Lapsed

Process for the production of a block of piezoelectric macromolecular material

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