Patent US4350672A successfully refreshed from Google Patents.
US4350672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binderless carbon or graphite articles
Assignee: RTX Corp
•
Filing: 1977-12-23
•
Granted: 1982-09-21
•
Expires: 1997-12-23
Abstract
Abstract A process for producing binderless, single phase bulk carbon or graphite articles having a fibrillar microstructure comprising the steps of assembling a plurality of polymer fibers into a preselected pattern, subjecting them to a temperature and pressure sufficient to cause heat distortion flow and concomitant self-bonding of contiguous fibers and pyrolyzing the fibers in a nonoxidizing atmosphere.
Inventors
- 👤 George K. Layden, Jr.
- 👤 Romeo G. Bourdeau
- 👤 Roscoe A. Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:11
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; C04B35/528; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/15; D01F9/155; D01F9/20; D01F9/21; D01F9/22; D01F9/24
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
47 words
A high strength, high modulus, binderless, single phase bulk carbon article having fibrillar microstructure and a Young's modulus of at least 2.5×10 7 psi (172 GPa) consisting essentially of a heat distortion flowed, unimpregnated, concomitant, self-bonded pyrolysis product of a plurality of substantially unidirectionally oriented polymer fibers.
Claim 2
Dependent Claim
47 words
A high strength, high modulus, binderless, single phase bulk carbon article having fibrillar microstructure and a Young's modulus of at least 2.5×10 7 psi (172 GPa) consisting essentially of a heat distortion flowed, unimpregnated, concomitant, self-bonded pyrolysis product of a plurality of substantially unidirectionally oriented polymer fibers.
Claim 3
Dependent Claim
12 words
The article of claim 1 wherein the polymer is an acrylic copolymer.
Claim 4
Dependent Claim
13 words
The article of claim 2 wherein the acrylic copolymer comprises approximately 90% acrylonitrile.
Claim 5
Dependent Claim
10 words
The article of claim 1 wherein the polymer is polybenzimidazole.
Claim 6
Dependent Claim
28 words
The article of claim 1 wherein the polymer is selected from the group consisting of homopolymers, copolymers, terpolymers, and graft copolymers of acrylonitrile, containing at least 50% acrylonitrile.
Claim 7
Dependent Claim
28 words
The article of claim 1 wherein the polymer is selected from the group consisting of aromatic polycyclic polymers, polyvinyl alcohol, polyvinyl chloride, polymethyl vinylketone, coal tar, and pitch.
Claim 8
Dependent Claim
13 words
The article of claim 1 having a modulus of rupture of 45,000 psi.
Claim 9
Dependent Claim
20 words
The article of claim 1 having a modulus of rupture of 70,000 psi and a Young's modulus of 25,000,000 psi.
Claim 10
Dependent Claim
20 words
The article of claim 1 having a modulus of rupture of 83,000 psi and a Young's modulus of 33,000,000 psi.
Claim 11
Dependent Claim
20 words
The article of claim 1 having a modulus of rupture of 83,000 psi and a Young's modulus of 50,000,000 psi.
Claim 12
Dependent Claim
50 words
A high strength, high modulus, binderless, single phase bulk carbon article having fibrillar microstructure and a modulus of rupture of at least 7000 psi (48.2 MPa) consisting essentially of a heat distortion flowed, unimpregnated, concomitant, self-bonded pyrolysis product of a plurality of two or three dimensionally oriented short-length polymer fibers.
Claim 13
Dependent Claim
50 words
A high strength, high modulus, binderless, single phase bulk carbon article having fibrillar microstructure and a modulus of rupture of at least 7000 psi (48.2 MPa) consisting essentially of a heat distortion flowed, unimpregnated, concomitant, self-bonded pyrolysis product of a plurality of two or three dimensionally oriented short-length polymer fibers.
Claim 14
Dependent Claim
12 words
The article of claim 11 wherein the polymer is an acrylic copolymer.
Claim 15
Dependent Claim
13 words
The article of claim 12 wherein the acrylic copolymer comprises approximately 90% acrylonitrile.
Claim 16
Dependent Claim
10 words
The article of claim 11 wherein the polymer is polybenzimidazole.
Claim 17
Dependent Claim
28 words
The article of claim 11 wherein the polymer is selected from the group consisting of homopolymers, copolymers, terpolymers, and graft copolymers of acrylonitrile, containing at least 50% acrylonitrile.
Claim 18
Dependent Claim
28 words
The article of claim 11 wherein the polymer is selected from the group consisting of aromatic polycyclic polymers, polyvinyl alcohol, polyvinyl chloride, polymethyl vinylketone, coal tar, and pitch.
Claim 19
Dependent Claim
15 words
The article of claim 11 having a modulus of rupture of 20,000 psi (138 MPa).
Claim 20
Dependent Claim
15 words
The article of claim 11 having a modulus of rupture of 10,500 psi (72 MPa).
References Cited (Backward Citations)
US349572A
Cited
US3233014A
Cited
US3407038A
Cited
US3412062A
Cited
US3579401A
Cited
US3639266A
Cited
US3629379A
Cited
US3728423A
Cited
US3994762A
Cited
US3903248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |