US4086382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing fire resistant wood products and product thereof
Assignee: American Door Company of Michigan Inc
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Filing: 1977-01-05
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Granted: 1978-04-25
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Expires: 1997-01-05
Abstract
Abstract A method of producing fire resistant wood products wherein a plurality of thin wood strips, each having a multiplicity of uniformly close spaced surface indentations, are bonded together in a stack by a binder having fine particles of inert non-flammable material mixed therein to produce a laminated wood unit having a multiplicity of close spaced cavities throughout which are filled with a set binder containing non-flammable material.
Inventors
- 👤 Clifford C. Hites
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/13; B32B3/00; B32B3/26; B32B3/30; B32B7/00; B32B7/04; B32B7/12; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/24579; Y10T428/24612; Y10T428/25; Y10T428/259; Y10T428/26; Y10T428/31504; Y10T428/31725; Y10T428/31768; Y10T428/31772
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
In a process of making a fire resistant wood product, the steps of assembling in stacked relation a plurality of thin strips of hard wood each having a plurality of indentations of a depth of 25% to 50% of the thickness of the strip in at least one face thereof in substantially uniformly and close spaced relation after coating of the surfaces and filling the indentations of each strip which confronts another strip in the stack with a cement in which an inert non-flammable filler material has been substantially uniformly distributed in an amount from 30% to 40% by weight of the total weight of the cement, and subjecting said stack of strips to heat and pressure for a period of time sufficient to set said cement and bond the strips of the stack in selected thickness.
Claim 2
Dependent Claim
137 words
In a process of making a fire resistant wood product, the steps of assembling in stacked relation a plurality of thin strips of hard wood each having a plurality of indentations of a depth of 25% to 50% of the thickness of the strip in at least one face thereof in substantially uniformly and close spaced relation after coating of the surfaces and filling the indentations of each strip which confronts another strip in the stack with a cement in which an inert non-flammable filler material has been substantially uniformly distributed in an amount from 30% to 40% by weight of the total weight of the cement, and subjecting said stack of strips to heat and pressure for a period of time sufficient to set said cement and bond the strips of the stack in selected thickness.
Claim 3
Dependent Claim
32 words
The method defined in claim 1 wherein said strips are formed of wood having a density of at least 38 pounds per cubic foot and a thickness between 1/12 and 1/8 inch.
Claim 4
Dependent Claim
33 words
The method defined in claim 1 wherein said strips are formed of hard wood having a thickness from 1/12 to 1/8 inch and said indentations are spaced apart from 5/32 to 7/32 inch.
Claim 5
Dependent Claim
18 words
The method defined in claim 1 wherein said indentations constitute substantially uniformly spaced grooves extending across the strip.
Claim 6
Dependent Claim
42 words
The method defined in claim 1, wherein said indentations are formed on both faces of strips located within the stack and the strips are arranged in the stack with indentations in the confronting faces of adjacent strips at least partially in register.
Claim 7
Dependent Claim
55 words
The method defined in claim 1, wherein said cement is of the heat setting type including casein glue, or resorcinol glue such as phenol resorcinol glue catalyzed with formaldehyde, or a mixture of sodium, silicate, sodium metasilicate and a surfactant, and said inert filler material is a clay of a fineness of approximately 200 microns.
Claim 8
Dependent Claim
30 words
The method defined in claim 1 wherein said cement is of the type which sets in approximately 10 minutes when subjected to a temperature from 335° F. to 360° F.
Claim 9
Dependent Claim
100 words
A fire resistant wood product comprising a stack of similar thin strips of hard wood each having a plurality of substantially uniformly spaced indentations having a depth of 25% to 50% of the thickness of the strips in at least one face thereof to define spaced interior cavities throughout the stack, the strips of the stack being of a thickness of from 1/12 to 1/8 inch and bonded together by a binding agent which fills all cavities and contains uniformly distributed therein fine particles of inert non-flammable filler material constituting from 30% to 40% of the binding agent by weight.
Claim 10
Dependent Claim
100 words
A fire resistant wood product comprising a stack of similar thin strips of hard wood each having a plurality of substantially uniformly spaced indentations having a depth of 25% to 50% of the thickness of the strips in at least one face thereof to define spaced interior cavities throughout the stack, the strips of the stack being of a thickness of from 1/12 to 1/8 inch and bonded together by a binding agent which fills all cavities and contains uniformly distributed therein fine particles of inert non-flammable filler material constituting from 30% to 40% of the binding agent by weight.
Claim 11
Dependent Claim
19 words
A fire resistant product as defined in claim 8, wherein said indentations are spaced grooves extending across each lamination.
Claim 12
Dependent Claim
39 words
A fire resistant product as defined in claim 8, wherein said binding agent is a glue which sets under heat and pressure and said non-flammable material in said glue is a clay having a fineness of approximately 200 microns.
Claim 13
Dependent Claim
36 words
A fire resistant product as defined in claim 8, wherein said indentations are of a width of substantially 3/32 inch to 5/32 inch and are spaced apart a distance of substantially 5/32 inch to 7/32 inch.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |