US 5238672
MESOPHASE PITCHES, CARBON FIBER PRECURSORS, AND CARBONIZED FIBERS
Assignee
ASHLAND OIL, INC., ASHLAND, KY. A CORP. OF KY.
Filed
Jun 20, 1989
Granted
Aug 24, 1993
Location
CEREDO WV US
Abstract
Producing carbon fiber precursors and carbonized fibers comprise by treating a thin film of catalytic pitch at elevated temperature conditions, treating the resulting heavy isotropic pitch by agitating with an inert gas under elevated temperature conditions to form a mesophase pitch, forming green fibers from said mesophase pitch, stabilizing and optionally carbonizing said green fibers to obtain the desired product.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Feb 28, 1990
Rescinded
Jul 29, 1992
Duration
2 years, 5 months
Inventor
- 1MICHAEL B. SUMNER
Record Details
- Patent number
- US 5238672
- Application
- 07369442
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
Browse by Assignee
ASHLAND OIL, INC., ASHLAND, KY. A CORP. OF KY.Back to patent indexSource: USPTO 35 USC §181 secrecy order records