US4569873A — Composite wood panel

Claim 1

Independent Claim 127 words

A dimensionally stable panel comprising spaced facing exposed veneer sheets disposed with the grain in one exposed veneer sheet substantially parallel with the grain in the other exposed veneer sheet, an intermediate veneer sheet coextensive with the exposed veneer sheets and disposed substantially centralized between the exposed veneer sheets with the grain of said intermediate veneer sheet substantially perpendicular to the grains of the exposed veneer sheets, and a mat comprising adhesively bonded biomass particles disposed between each exposed veneer sheet and the intermediate veneer sheet and bonded to each of the adjacent veneer sheets, each said mat having a thickness greater than that of said exposed veneer sheets, said intermediate veneer sheet restraining linear expansion of the panel across the grains of the exposed veneer sheets.

Claim 2

Dependent Claim 127 words

A dimensionally stable panel comprising spaced facing exposed veneer sheets disposed with the grain in one exposed veneer sheet substantially parallel with the grain in the other exposed veneer sheet, an intermediate veneer sheet coextensive with the exposed veneer sheets and disposed substantially centralized between the exposed veneer sheets with the grain of said intermediate veneer sheet substantially perpendicular to the grains of the exposed veneer sheets, and a mat comprising adhesively bonded biomass particles disposed between each exposed veneer sheet and the intermediate veneer sheet and bonded to each of the adjacent veneer sheets, each said mat having a thickness greater than that of said exposed veneer sheets, said intermediate veneer sheet restraining linear expansion of the panel across the grains of the exposed veneer sheets.

Claim 3

Dependent Claim 39 words

The panel of claim 1 wherein each of the veneer sheets exposed on the surface of the panel is about 1/20 to about 1/8 inch thick and the intermediate veneer sheet is about 1/10 to about 3/16 inch thick.

Claim 4

Dependent Claim 13 words

The panel of claim 1 wherein said bonded biomass particles are lignocellulose particles.

Claim 5

Dependent Claim 22 words

The panel of claim 1 wherein said particles are bonded together with a polymeric organic polyisocyanate and to the intermediate veneer sheet.

Claim 6

Dependent Claim 21 words

The panel of claim 1 wherein the said mats are bonded to the exposed veneer sheets with a phenol formaldehyde resin.

Claim 7

Dependent Claim 12 words

The panel of claim 1 wherein said bonded biomass particles are bagasse.

Claim 8

Dependent Claim 125 words

A process for making a structural composite wood panel which comprises assembling face to face first and second wood veneer sheets having the grains thereof disposed in substantially the same direction and a third veneer sheet substantially centrally disposed coextensively between the said first and second veneer sheets with its grain substantially perpendicular to the grains of the first and second veneer sheets and, between the third veneer sheet and each of the first and second veneer sheets, a mass of biomass particles blended with particles of a thermosetting resinous or chemically reactive adhesive, and heating and pressing the resulting assembly to cure the adhesive to bond the particles together and to bond the resulting mats thereof to adjacent faces of the three veneer sheets.

Claim 9

Dependent Claim 125 words

A process for making a structural composite wood panel which comprises assembling face to face first and second wood veneer sheets having the grains thereof disposed in substantially the same direction and a third veneer sheet substantially centrally disposed coextensively between the said first and second veneer sheets with its grain substantially perpendicular to the grains of the first and second veneer sheets and, between the third veneer sheet and each of the first and second veneer sheets, a mass of biomass particles blended with particles of a thermosetting resinous or chemically reactive adhesive, and heating and pressing the resulting assembly to cure the adhesive to bond the particles together and to bond the resulting mats thereof to adjacent faces of the three veneer sheets.

Claim 10

Dependent Claim 40 words

The process of claim 7 wherein the assembly is heated and pressed between plattens at a temperature of about 300° F. to 350° F. or higher at a pressure of at least about 300 to about 450 psi or higher.

Claim 11

Dependent Claim 11 words

The process of claim 8 wherein the adhesive is phenol formaldehyde.

Claim 12

Dependent Claim 12 words

The process of claim 8 wherein the adhesive is an organic polyisocyanate.

Claim 13

Dependent Claim 17 words

The product of claim 1 wherein a strengthening synthetic resin fiber is mixed with said biomass particles.

Claim 14

Dependent Claim 11 words

The product of claim 11 wherein the said fibers are fiberglass.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-02-10	1989-08-12	1990-02-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-02-10	1993-08-12	1994-02-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-02-10	1997-08-12	1998-02-11	$7700.00	Window Closed / Lapsed

Composite wood panel

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