US3879244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making high modulus graphite fiber reinforced tubes
Assignee: United States Department of the Air Force
•
Filing: 1973-04-18
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Granted: 1975-04-22
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Expires: 1993-04-18
Abstract
Abstract The invention concerns itself with a method for fabricating a tubular structural element having a wall structure composed of layers of a graphite fiber-reinforced resin composite in which the graphite fibers are oriented 45* from the zero degree longitudinal axis of the tubular element.
Inventors
- 👤 Mike Varlas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A METHOD FOR FABRICATING A TUBULAR STRUCTURAL MEMBER WHICH COMPRISES STTHE STEPS OF: A. PROVIDING A PLY OF A GRAPHITE FIBER-REINFORCED RESIN COMPOSITE PRE-CUT TO PREDETERMINED DIMENSIONS AND CONSISTING OF A PAIR OF SECTIONS BUTTED TOHETHER, EACH SECTION HAVING PARALLEL RUNNING FIBERS ORIENTED 45* FROM A ZERO DEGREE LONGITUDINAL AXIS SUCH THAT THE FIBERS OF EACH SECTION ARE ORTHOGONALLY ORIENTED WITH RESPECT TO EACH OTHER; B. FORMING A FLAT-LAYUP OF COMBINING A PLURALITY OF SAID ORIENTED PLIES IN JUXTAPOSED RELATIONSHIP SUCH THAT PARALLEL RUNNING FIBERS OF SUPERPOSED LAYERS GENERALLY HAVE AN ORTHOGONAL RELATION SHIP TO EACH OTHER; C. COMPRESSING SAID FLAT-LAYUP AT A TEMPERATURE AND PRESSURE SUFFICIENT TO COMPACT SAID LAYERS; D. WARPPING SAID COMPACTED FLAT-LAYUP AROUND THE OUTER SURFACE OF A TUBE FORMING MANDREL; E. CURING SAID WRAPPED LAYUP AT A TEMPERATURE AND PRESSURE SUFFICIENT TO FORM A TUBE AROUND SAID MANDREL; AND F. REMOVING SAID SAID MANDREL.
Claim 2
Independent Claim
149 words
A METHOD FOR FABRICATING A TUBULAR STRUCTURAL MEMBER WHICH COMPRISES STTHE STEPS OF: A. PROVIDING A PLY OF A GRAPHITE FIBER-REINFORCED RESIN COMPOSITE PRE-CUT TO PREDETERMINED DIMENSIONS AND CONSISTING OF A PAIR OF SECTIONS BUTTED TOHETHER, EACH SECTION HAVING PARALLEL RUNNING FIBERS ORIENTED 45* FROM A ZERO DEGREE LONGITUDINAL AXIS SUCH THAT THE FIBERS OF EACH SECTION ARE ORTHOGONALLY ORIENTED WITH RESPECT TO EACH OTHER; B. FORMING A FLAT-LAYUP OF COMBINING A PLURALITY OF SAID ORIENTED PLIES IN JUXTAPOSED RELATIONSHIP SUCH THAT PARALLEL RUNNING FIBERS OF SUPERPOSED LAYERS GENERALLY HAVE AN ORTHOGONAL RELATION SHIP TO EACH OTHER; C. COMPRESSING SAID FLAT-LAYUP AT A TEMPERATURE AND PRESSURE SUFFICIENT TO COMPACT SAID LAYERS; D. WARPPING SAID COMPACTED FLAT-LAYUP AROUND THE OUTER SURFACE OF A TUBE FORMING MANDREL; E. CURING SAID WRAPPED LAYUP AT A TEMPERATURE AND PRESSURE SUFFICIENT TO FORM A TUBE AROUND SAID MANDREL; AND F. REMOVING SAID SAID MANDREL.
References Cited (Backward Citations)
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |