US4026998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon artefacts
Assignee: Coal Industry Patents Ltd
•
Filing: 1975-12-02
•
Granted: 1977-05-31
•
Expires: 1995-12-02
Abstract
Abstract Carbon composites are made by mixing carbonizable binder, calcined coke grist and carbon fibre rods or needles of carbon fibre bundles in a hardened matrix, shaping the mixture into an artefact and carbonizing the binder, optionally with graphitizing. The composites may be used as carbon electrodes and have a low coefficient of thermal expanson.
Inventors
- 👤 Michael Anthony Ambrose Jorro
- 👤 Terry Dean Rantell
- 👤 Diana Louise Tosswill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
A composite carbon artefact comprising 15-35% carbonised binder, 15-84% calcined coke grist and 1-50% of disoriented carbon fibre rods composed of carbon fibres in a carbonised matrix.
Claim 2
Dependent Claim
27 words
A composite carbon artefact comprising 15-35% carbonised binder, 15-84% calcined coke grist and 1-50% of disoriented carbon fibre rods composed of carbon fibres in a carbonised matrix.
Claim 3
Dependent Claim
12 words
An artefact as claimed in claim 1, wherein the artefact is graphitised.
Claim 4
Dependent Claim
26 words
An artefact as claimed in claim 1, wherein the carbon fibre rods are present in an amount of 1 to 20% by weight of said mixture.
Claim 5
Dependent Claim
21 words
An artefact as claimed in claim 3, wherein the carbon fibre rods comprise more than 50% by volume of carbon fibre.
Claim 6
Dependent Claim
23 words
An artefact as claimed in claim 4, wherein the matrix for the carbon fibre rod prior to carbonisation was a cured thermosetting resin.
Claim 7
Dependent Claim
24 words
An artefact as claimed in claim 1, wherein the carbonised binder prior to carbonisation had a softening point of from 100° to 140° C.
Claim 8
Independent Claim
55 words
A method for the production of a composite carbon artefact comprising mixing 15-35% of a carbonisable binder, 15-84% calcined coke grist and 1-50% carbon fibre rods composed of carbon fibres in a hardened matrix, shaping the resultant mixture into an artefact and carbonising the binder in the shaped artefact to form the composite carbon artefact.
Claim 9
Independent Claim
55 words
A method for the production of a composite carbon artefact comprising mixing 15-35% of a carbonisable binder, 15-84% calcined coke grist and 1-50% carbon fibre rods composed of carbon fibres in a hardened matrix, shaping the resultant mixture into an artefact and carbonising the binder in the shaped artefact to form the composite carbon artefact.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |