US4592939A — Method of rendering uniform coating on disks and …

Claim 1

Independent Claim 77 words

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of: formulating a coating mixture; and applying this mixture in a prescribed stream to the disk surface so as to form one or several arcuate bead segments, extending circularly or spirally about the disk surface; the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating.

Claim 2

Independent Claim 77 words

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of: formulating a coating mixture; and applying this mixture in a prescribed stream to the disk surface so as to form one or several arcuate bead segments, extending circularly or spirally about the disk surface; the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating.

Claim 3

Dependent Claim 31 words

The method as recited in claim 1 wherein the mixture is so formulated and the bead segments are so distributed, in contiguity or near-contiguity to one another, as to be "self-leveling".

Claim 4

Dependent Claim 58 words

The method as recited in claim 1 wherein the mixture is dispensed through nozzle means, being formulated to exhibit a prescribed viscosity apt for such dispensing, as well as to exhibit a prescribed thixotropy and wetting characteristic relative to said disk surface whereby the deposited bead segments will "set-up" thereon for sufficient time to allow the leveling action.

Claim 5

Dependent Claim 31 words

The method as recited in claim 3 wherein the mixture is so formulated and the bead segments are so distributed, in contiguity or near-contiguity to one another, as to be "self-leveling".

Claim 6

Dependent Claim 68 words

The combination as recited in claim 3 wherein the bead-forming step is followed by application of a prescribed relatively uniform, continuous "solvent-mist" of a prescribed solvent adapted to wet said mixture and the disk surface, this mist being applied to wet and coat the so-applied beads and the intervening disk surface relatively continuously, this solvent also being selected and applies so as to induce and enhance said leveling.

Claim 7

Dependent Claim 31 words

The method as recited in claim 1 wherein the bead is applied as one continuous spiral with successive adjacent segments kept spaced by a prescribed bead-spacing apt for such leveling action.

Claim 8

Dependent Claim 59 words

The method as recited in claim 6 wherein the mixture is dispensed through nozzle means, being formulated to exhibit a prescribed viscosity apt for such dispensing, as well as to exhibit a prescribed thixotropy and wetting characteristic relative to said segments and said disk surface whereby the beads will "set-up" thereon for sufficient time to allow the leveling action.

Claim 9

Dependent Claim 28 words

The method as recited in claim 7 wherein the mixture is formulated to include a prescribed "setting-surfactant" specified for the indicated "wetting", while also imparting said "set-up" action.

Claim 10

Dependent Claim 42 words

The method as recited in claim 7 wherein the mixture includes at least one acrylate plus at least one associated viscosity-controlling diluent and a compatible cross-linking entity, along with one or more compatible surfactants adapted for imparting said "wetting" and said "set-up".

Claim 11

Dependent Claim 44 words

The method as recited in claim 9 wherein the disk surface is comprised of a prescribed polymer and where a corresponding surfactant is included, tailored to impart said wetting of the beads and this polymer surface, as well as to so "set-up" the beads.

Claim 12

Dependent Claim 30 words

The method as recited in claim 10 wherein the solvent-leveling is achieved by application of an ultra-thin continuous film of a solvent like acetone, ethyl acetate, methylene chloride or methyl-ethyl-ketone.

Claim 13

Independent Claim 183 words

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of: formulating a coating mixture; and applying this mixture in a prescribed stream to the disk surface so as to form one or several arcuate bead segments, extending circularly or spirally about the disk surface; the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating; this mixture being dispensed through nozzle means, and being formulated to exhibit a prescribed viscosity apt for such dispensing, as well as to exhibit a prescribed thixotropy and wetting characteristic relative to said disk surface whereby the deposited bead segments will "set-up" thereon for sufficient time to allow the leveling action; this nozzle means being adapted and controlled to so dispense the mixture at a prescribed delivery rate, wherein the nozzle means is mounted on arm means adapted and controlled to be translated radially of said disk, the disk being optionally rotated at from zero to a prescribed rpm adapted to compensate for asymmetric bead leveling.

Claim 14

Independent Claim 183 words

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of: formulating a coating mixture; and applying this mixture in a prescribed stream to the disk surface so as to form one or several arcuate bead segments, extending circularly or spirally about the disk surface; the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating; this mixture being dispensed through nozzle means, and being formulated to exhibit a prescribed viscosity apt for such dispensing, as well as to exhibit a prescribed thixotropy and wetting characteristic relative to said disk surface whereby the deposited bead segments will "set-up" thereon for sufficient time to allow the leveling action; this nozzle means being adapted and controlled to so dispense the mixture at a prescribed delivery rate, wherein the nozzle means is mounted on arm means adapted and controlled to be translated radially of said disk, the disk being optionally rotated at from zero to a prescribed rpm adapted to compensate for asymmetric bead leveling.

Claim 15

Dependent Claim 38 words

The combination as recited in claim 12 wherein the delivery rate, translation rate and disk rpm are inter-controlled to effect deposition of said segments of a prescribed uniform size and configuration, and at a prescribed constant segment separation.

Claim 16

Dependent Claim 37 words

The combination as recited in claim 13 wherein deposition places said segments contiguous, or nearly so, whereby to induce self-leveling and wherein deposition proceeds "from outward-inward" so as to help compensate for inward-pushing by an adjacent segment.

Claim 17

Dependent Claim 42 words

The combination as recited in claim 14 wherein for a constant delivery rate, disk rpm is continually increased as a function of segment position, radially, and arm velocity is also controllably varied whereby to improve the thickness uniformity of the ultimate coating.

Claim 18

Independent Claim 69 words

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of: formulating a coating mixture; and applying this mixture to the disk surface so as to form one or several bead segments, extending about the disk surface; the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating.

Claim 19

Independent Claim 69 words

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of: formulating a coating mixture; and applying this mixture to the disk surface so as to form one or several bead segments, extending about the disk surface; the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating.

Claim 20

Dependent Claim 31 words

The method as recited in claim 16 wherein the mixture is so formulated and the bead segments are so distributed, in contiguity or near-contiguity to one another, as to be "self-leveling".

Claim 21

Dependent Claim 8 words

The product of the method in claim 16.

Claim 22

Dependent Claim 8 words

The product of the method in claim 17.

Claim 23

Dependent Claim 9 words

The product of the method recited in claim 1.

Claim 24

Dependent Claim 9 words

The product of the method recited in claim 2.

Claim 25

Dependent Claim 9 words

The product of the method recited in claim 3.

Claim 26

Dependent Claim 9 words

The procuct of the method recited in claim 10.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-06-02	1989-12-02	1990-06-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-06-02	1993-12-02	1994-06-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-06-02	1997-12-02	1998-06-03	$7700.00	Window Closed / Lapsed

Method of rendering uniform coating on disks and product

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