US4938824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a composite component using a transverse tape
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1987-01-23
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Granted: 1990-07-03
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Expires: 2007-01-23
Abstract
Abstract A method and apparatus for making a composite component. For making a non-cylindrical composite component such as a nozzle, a longitudinal winding of at least one fiber strand impregnated with resin is applied onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the mandrel rotational axis. A transverse tape is then spirally cut from the layer and wound onto a component mandrel. The wound transverse tape is then compacted and cured and the mandrel removed. A nozzle exit cone is also disclosed made from such transverse tape so that the fiber strand portions are short enough that they do not follow the curvature of the nozzle and thereby peel. The windings are shingled onto the nozzle exit cone so that only one end of each of the fiber strand portions is exposed to the nozzle surface. The fiber strand portions are oriented at a predetermined angle which may be optimized for erosion resistance and stress requirements. In order to form a cylindrical composite component, a cylindrical component mandrel is rotated about its rotational axis in a stationary position, at least one transverse tape of resin impregnated fiber strand portions is supplied to the mandrel in position for rolling onto the mandrel, the transverse tape which is rolled onto the mandrel is compacted and cured, and the mandrel is removed. Apparatus for forming both small cylindrical components such as space strut tubes and large cylindrical components such as rocket motor cases or launch canisters in accordance with this method are also disclosed. Such apparatus may include ultrasonic heads for heating the resin in particular if a thermoplastic resin is used for high impact resistance.
Inventors
- 👤 Dean C. Youngkeit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:31
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/54; B29C70/545; B29C53/00; B29C53/56; B29C53/566; B29C53/58; B29C53/581; B29C53/583; B29C53/585; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/202; B29C70/30; B29C70/32; B29C70/38; B29C70/382; B29C70/386; B29C70/40; B29C70/50; F; F02; F02K; F02K9/00; F02K9/97; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1061; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24116
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
323 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel.
Claim 2
Independent Claim
323 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel.
Claim 3
Independent Claim
366 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the method further comprises selecting the matrix material from the group of thermoplastic resins and heating the transverse tape while it is on the mandrel to melt the matrix material in the transverse tape as it is being rolled onto the mandrel.
Claim 4
Independent Claim
366 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the method further comprises selecting the matrix material from the group of thermoplastic resins and heating the transverse tape while it is on the mandrel to melt the matrix material in the transverse tape as it is being rolled onto the mandrel.
Claim 5
Independent Claim
342 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, the method further comprising selecting the matrix material to have a glass transition temperature greater than about 400° F.
Claim 6
Independent Claim
342 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, the method further comprising selecting the matrix material to have a glass transition temperature greater than about 400° F.
Claim 7
Independent Claim
346 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto a component mandrel comprises applying a plurality of shingled windings on the component material.
Claim 8
Independent Claim
346 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto a component mandrel comprises applying a plurality of shingled windings on the component material.
Claim 9
Independent Claim
365 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto a component mandrel comprises applying a plurality of shingled windings on the component mandrel, the method further comprising selecting the matrix material to have a glass transition temperature greater than about 400° F.
Claim 10
Independent Claim
365 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto a component mandrel comprises applying a plurality of shingled windings on the component mandrel, the method further comprising selecting the matrix material to have a glass transition temperature greater than about 400° F.
Claim 11
Independent Claim
372 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto the component mandrel comprises applying a plurality of shingled windings on the component mandrel, the method further comprising selecting the at least one fiber strand to be composed of a material selected from the group consisting of carbon and graphite.
Claim 12
Independent Claim
372 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto the component mandrel comprises applying a plurality of shingled windings on the component mandrel, the method further comprising selecting the at least one fiber strand to be composed of a material selected from the group consisting of carbon and graphite.
Claim 13
Independent Claim
390 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto a component mandrel comprises applying a plurality of shingled windings on the component mandrel, the method further comprising selecting the at least one fiber strand to be composed of a material selected from the group consisting of carbon and graphite and further comprising selecting the matrix material to have a glass transition temperature greater than about 400° F.
Claim 14
Independent Claim
390 words
A method for making a composite component comprises the steps of: a. applying at least one fiber strand impregnated with a matrix material onto a generally cylindrical mandrel at a predetermined angle relative to a line parallel to the rotational axis of the mandrel to form at least one layer of two crossing windings of unwoven, unknitted, and unstitched matrix impregnated fiber strand portions wherein the fiber strand portions are held together by the tack of the matrix material and wherein the fiber strand portions in each winding are parallel to each other wherein the step of applying at least one fiber strand comprises rotating the generally cylindrical mandrel while holding the generally cylindrical mandrel in a stationary position between its ends, forming the layer of fiber strand portions on a conveyor belt, and moving the conveyor belt to convey the layer of fiber strand portions to the generally cylindrical mandrel and rolling the layer of fiber strand portions on the generally cylindrical mandrel as it is formed on the conveyor belt afterwhich the transverse tape is cut from the layer of fiber strand portions while it is on the generally cylindrical mandrel; b. cutting from the layer while it is on the mandrel a transverse tape comprising a strip of unwoven, unknitted, and unstitched fiber strand portions which are held together by the tack of the matrix material whereby the fiber strand portions are not held together by weaving, knitting, or stitching, the transverse tape having at least two plies and a pair of parallel edges wherein fiber strand portions in each ply extend parallel to each other between the edges and are oriented at an angle, relative to a line passing through the edges and perpendicular to the edges, which is substantially equal to said predetermined angle; c. winding the transverse tape onto a component mandrel; d. compacting and curing the wound matrix impregnated transverse tape; and e. removing the mandrel, wherein the step of winding the transverse tape onto a component mandrel comprises applying a plurality of shingled windings on the component mandrel, the method further comprising selecting the at least one fiber strand to be composed of a material selected from the group consisting of carbon and graphite and further comprising selecting the matrix material to have a glass transition temperature greater than about 400° F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |