US4241133A
Expired / Lapsed
US
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Structural members of composite wood material and process for making same
Assignee: Weyerhaeuser Co
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Filing: 1979-04-02
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Granted: 1980-12-23
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Expires: 1999-04-02
Abstract
Abstract Structural members having strength properties comparable or superior to those of solid wood are made from a composite wood material comprised of elongated wood flakes bonded together with a binder. The grain direction of the flakes extend generally parallel to their longitudinal axis and the flakes are oriented so that the longitudinal axis of at least a majority is generally parallel to the longitudinal axis of the structural member. The structural member is formed as a solid one-piece unit or assembled from two or more structural components which are made from the composite wood material and are joined together in angular relationship with an adhesive.
Inventors
- 👤 Anders E. Lund
- 👤 Gordon P. Krueger
- 👤 Darrell D. Nicholas
- 👤 Roy D. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/12; E04C3/14; B; B27; B27N; B27N5/00; E04C2/00; E04C2/02; E04C2/10; E04C2/16; E04C3/28; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
141 words
A method for making a structural member of a composite wood material and having an axis, said method including steps of: (a) providing elongated wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, an average length to average width ratio of about 4:1 to about 10:1 and an average thickness of about 0.01 to about 0.05 inch, (b) admixing a binder with the wood flakes, (c) forming a layered mat of the resulting mixture with at least a majority of the wood flakes oriented such that the longitudinal axis thereof is generally parallel to the axis of the structural member to be formed from the mat, and (d) applying sufficient pressure on the mat to bond the wood flakes together and form the structural member.
Claim 2
Independent Claim
141 words
A method for making a structural member of a composite wood material and having an axis, said method including steps of: (a) providing elongated wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, an average length to average width ratio of about 4:1 to about 10:1 and an average thickness of about 0.01 to about 0.05 inch, (b) admixing a binder with the wood flakes, (c) forming a layered mat of the resulting mixture with at least a majority of the wood flakes oriented such that the longitudinal axis thereof is generally parallel to the axis of the structural member to be formed from the mat, and (d) applying sufficient pressure on the mat to bond the wood flakes together and form the structural member.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein at least 90% of the wood flakes oriented in the recited manner.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein the wood flakes have an average of about 1 to about 2 inches.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein the wood flakes have an average thickness of about 0.015 to about 0.025 inch.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein the average width of the wood flakes is about 0.1 to about 0.5 inch.
Claim 7
Dependent Claim
38 words
A method according to claim 1 wherein the amount of binder admixed with the wood flakes during step (b) is about 5 to about 12 weight %, as solids based on the dry weight of the wood flakes.
Claim 8
Dependent Claim
22 words
A method according to claim 6 wherein the binder includes an organic polyisocyanate having at least two active isocyanate groups per molecule.
Claim 9
Independent Claim
163 words
A method for making an elongated structural member of a composite wood material and having at least two elongated, angularly related components, said method including the steps of: (a) providing elongated wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, an average length to average width ratio of about 4:1 to about 10:1 and an average thickness of about 0.01 to about 0.05 inch, (b) admixing a binder with the wood flakes, (c) forming a layered mat of the resulting mixture for each of the components with at least a majority of the wood flakes oriented such that the longitudinal axis thereof is generally parallel to the longitudinal axis of the component to be formed from the mat, (d) applying sufficient pressure on the mats to bond the wood flakes together and form the respective component, and (e) bonding the components together to form the structural member.
Claim 10
Independent Claim
163 words
A method for making an elongated structural member of a composite wood material and having at least two elongated, angularly related components, said method including the steps of: (a) providing elongated wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, an average length to average width ratio of about 4:1 to about 10:1 and an average thickness of about 0.01 to about 0.05 inch, (b) admixing a binder with the wood flakes, (c) forming a layered mat of the resulting mixture for each of the components with at least a majority of the wood flakes oriented such that the longitudinal axis thereof is generally parallel to the longitudinal axis of the component to be formed from the mat, (d) applying sufficient pressure on the mats to bond the wood flakes together and form the respective component, and (e) bonding the components together to form the structural member.
Claim 11
Dependent Claim
93 words
A structural member made from a composite wood material and having an axis comprising: elongated wood flakes bonded together with a binder, said wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, an average length to average width ratio of about 4:1 to about 10:1, an average thickness of about 0.01 to about 0.05 inch and at least a majority being oriented such that the longitudinal axis is generally parallel to the axis of said structural member.
Claim 12
Dependent Claim
93 words
A structural member made from a composite wood material and having an axis comprising: elongated wood flakes bonded together with a binder, said wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, an average length to average width ratio of about 4:1 to about 10:1, an average thickness of about 0.01 to about 0.05 inch and at least a majority being oriented such that the longitudinal axis is generally parallel to the axis of said structural member.
Claim 13
Dependent Claim
21 words
A structural member according to claim 9 wherein at least 90% of the wood flakes are oriented in the recited manner.
Claim 14
Dependent Claim
23 words
A structural member according to claim 9 wherein the wood flakes have an average length of about 1 inches to about 2 inches.
Claim 15
Dependent Claim
22 words
A structural member according to claim 9 wherein the wood flakes have an average thickness of about 0.015 to about 0.025 inch.
Claim 16
Dependent Claim
22 words
A structural member according to claim 9 wherein the average width of the wood flakes is about 0.1 to about 0.5 inch.
Claim 17
Dependent Claim
28 words
A structural member according to claim 9 containing about 5 to about 12 weight % of binder, as solids based on the dry weight of the wood flakes.
Claim 18
Dependent Claim
23 words
A structural member according to claim 14 wherein the binder includes an organic polyisocyanate having at least two active isocyanate groups per molecule.
Claim 19
Dependent Claim
110 words
An elongated structural member of a composite wood material including at least two elongated structural components bonded together in angular relationship, each of said structural components being comprised of: elongated wood flakes bonded together with a binder, said wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, and average length to average width ratio of about 4:1 to about 10:1 and an average thickness of about 0.01 to about 0.05 inch and at least a majority being oriented such that the longitudinal axis is generally parallel to the longitudinal axis of said structural component.
Claim 20
Dependent Claim
110 words
An elongated structural member of a composite wood material including at least two elongated structural components bonded together in angular relationship, each of said structural components being comprised of: elongated wood flakes bonded together with a binder, said wood flakes having a grain direction extending generally parallel to the longitudinal axis thereof, an average length of about 0.5 inch to about 3.5 inches, and average length to average width ratio of about 4:1 to about 10:1 and an average thickness of about 0.01 to about 0.05 inch and at least a majority being oriented such that the longitudinal axis is generally parallel to the longitudinal axis of said structural component.
Claim 21
Dependent Claim
21 words
A structural member according to claim 16 wherein at least 90% of the wood flakes are oriented in the recited manner.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |