US3919376A
Expired / Lapsed
US
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Process for producing high mesophase content pitch fibers
Assignee: BP Corp North America Inc
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Filing: 1972-12-26
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Granted: 1975-11-11
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Expires: 1992-12-26
Abstract
Abstract An improved process for producing carbon fibers from pitch which has been transformed, in part, to a liquid crystal or so-called ''''mesophase'''' state. According to the process, the mesophase content of fibers spun from such pitch is increased before the fibers are thermoset and carbonized by vacuum distillation of the non-mesophase content of the fibers.
Inventors
- 👤 David A Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:42
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
88 words
A POCESS FOR PRODUCING A PITCH FIBER HAVING A HIGH MESOPHASE CONTENT WHICH COMPRISES SPINNING A CABONACEOUS FIBER FROM A NONTHIXOTROPIC CARBONACEOUS PITCH CONTAINING FROM 40 PERCENT BY WEIGHT TO 70 PERCENT BY WIGHT MESOPHASE, SAID MESOPHASE BEING PRESENT IN THE FORM OF LARGE, HOMOGENEOUS, ALESCED REGIONS, AND HEATING THE SPUN FIBER UNDER A PRESSURE OF LESS THAN 100 MICRONS HG AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO VOLATILIZE AT LEAST APORTION OF THE NON-MESOPHASE CONTENT OF THE FIBE AND PRODUE A FIBE HIGHE MESOPHASE CONTENT.
Claim 2
Dependent Claim
88 words
A POCESS FOR PRODUCING A PITCH FIBER HAVING A HIGH MESOPHASE CONTENT WHICH COMPRISES SPINNING A CABONACEOUS FIBER FROM A NONTHIXOTROPIC CARBONACEOUS PITCH CONTAINING FROM 40 PERCENT BY WEIGHT TO 70 PERCENT BY WIGHT MESOPHASE, SAID MESOPHASE BEING PRESENT IN THE FORM OF LARGE, HOMOGENEOUS, ALESCED REGIONS, AND HEATING THE SPUN FIBER UNDER A PRESSURE OF LESS THAN 100 MICRONS HG AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO VOLATILIZE AT LEAST APORTION OF THE NON-MESOPHASE CONTENT OF THE FIBE AND PRODUE A FIBE HIGHE MESOPHASE CONTENT.
Claim 3
Dependent Claim
19 words
A process as in claim 1 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 4
Dependent Claim
19 words
A process as in claim 1 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 5
Dependent Claim
34 words
A process as in claim 1 wherein the fiber is heated at a temperature and for a time sufficient to volatilize at least 5 percent by weight of the non-mesophase content of the fiber.
Claim 6
Dependent Claim
19 words
A process as in claim 4 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 7
Dependent Claim
19 words
A process as in claim 4 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 8
Dependent Claim
38 words
A process as in claim 1 wherein the fiber is heated at a temperature and for a time sufficient to volatilize from 10 percent by weight to 40 percent by weight of the non-mesophase content of the fiber.
Claim 9
Dependent Claim
19 words
A process as in claim 7 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 10
Dependent Claim
19 words
A process as in claim 7 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 11
Dependent Claim
20 words
A process as in claim 1 wherein the fiber is heated under a pressure of less than 30 microns Hg.
Claim 12
Dependent Claim
19 words
A process as in claim 10 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 13
Dependent Claim
19 words
A process as in claim 10 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 14
Dependent Claim
34 words
A process as in claim 10 wherein the fiber is heated at a temperature and for a time sufficient to volatilize at least 5 percent by weight of the non-mesophase content of the fiber.
Claim 15
Dependent Claim
19 words
A process as in claim 13 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 16
Dependent Claim
19 words
A process as in claim 13 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 17
Dependent Claim
38 words
A process as in claim 10 wherein the fiber is heated at a temperature and for a time sufficient to volatilize from 10 percent by weight to 40 percent by weight of the non-mesophase content of the fiber.
Claim 18
Dependent Claim
19 words
A process as in claim 16 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 19
Dependent Claim
19 words
A process as in claim 16 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 20
Dependent Claim
21 words
A process as in claim 1 wherein the pitch contains from 50 percent by weight to 65 percent by weight mesophase.
Claim 21
Dependent Claim
19 words
A process as in claim 19 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 22
Dependent Claim
19 words
A process as in claim 19 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 23
Dependent Claim
34 words
A process as in claim 19 wherein the fiber is heated at a temperature and for a time sufficinet to volatilize at least 5 percent by weight of the non-mesophase content of the fiber.
Claim 24
Dependent Claim
19 words
A process as in claim 22 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 25
Dependent Claim
19 words
A process as in claim 22 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 26
Dependent Claim
38 words
A process as in claim 19 wherein the fiber is heated at a temperature and for a time sufficient to volatilize from 10 percent by weight to 40 percent by weight of the non-mesophase content of the fiber.
Claim 27
Dependent Claim
19 words
A process as in claim 25 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 28
Dependent Claim
19 words
A process as in claim 25 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 29
Dependent Claim
20 words
A process as in claim 19 wherein the fiber is heated under a pressure of less than 30 microns Hg.
Claim 30
Dependent Claim
19 words
A process as in claim 28 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 31
Dependent Claim
19 words
A process as in claim 28 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 32
Dependent Claim
34 words
A process as in claim 28 wherein the fiber is heated at a temperature and for a time sufficient to volatilize at least 5 percent by weight of the non-mesophase content of the fiber.
Claim 33
Dependent Claim
19 words
A process as in claim 31 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 34
Dependent Claim
19 words
A process as in claim 31 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
Claim 35
Dependent Claim
38 words
A process as in claim 28 wherein the fiber is heated at a temperature and for a time sufficient to volatilize 10 10 percent by weight to 40 percent by weight of the non-mesophase content of the fiber.
Claim 36
Dependent Claim
19 words
A process as in claim 34 wherein the fiber is heated at a temperature of from 250*C. to 400*C.
Claim 37
Dependent Claim
19 words
A process as in claim 34 wherein the fiber is heated at a temperature of from 300*C. to 390*C.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |