Patent US4424145A successfully refreshed from Google Patents.
US4424145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium intercalated boronated carbon fiber
Assignee: BP Corp North America Inc
•
Filing: 1983-04-25
•
Granted: 1984-01-03
•
Expires: 2003-04-25
Abstract
Abstract A mesophase pitch derived carbon fiber which has been boronated and intercalated with calcium possesses a low resistivity and excellent mechanical properties.
Inventors
- 👤 Ramond V. Sara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:23
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/124; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/32; D01F9/322
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A mesophase pitch derived carbon fiber which has been boronated and intercalated with calcium, wherein said fiber contains from about 0.1% by weight to about 10% by weight boron and the calcium to boron weight ratio in said fiber is about 2:1.
Claim 2
Dependent Claim
42 words
A mesophase pitch derived carbon fiber which has been boronated and intercalated with calcium, wherein said fiber contains from about 0.1% by weight to about 10% by weight boron and the calcium to boron weight ratio in said fiber is about 2:1.
Claim 3
Dependent Claim
16 words
The carbon fiber of claim 1, wherein the resistivity of said fiber is about one microohm-meter.
Claim 4
Independent Claim
80 words
A method of producing a mesophase pitch derived carbon fiber having a low resistivity and excellent mechanical properties, comprising the steps of: producing a mesophase pitch derived carbon fiber from a mesophase pitch having a mesophase content of at least 70% by weight mesophase; boronating said fiber to contain from about 0.1% by weight to about 10% by weight boron; and intercalating said fiber with calcium so that the calcium to boron weight ratio in said fiber is about 2:1.
Claim 5
Independent Claim
80 words
A method of producing a mesophase pitch derived carbon fiber having a low resistivity and excellent mechanical properties, comprising the steps of: producing a mesophase pitch derived carbon fiber from a mesophase pitch having a mesophase content of at least 70% by weight mesophase; boronating said fiber to contain from about 0.1% by weight to about 10% by weight boron; and intercalating said fiber with calcium so that the calcium to boron weight ratio in said fiber is about 2:1.
Claim 6
Dependent Claim
17 words
The method of claim 3, wherein said boronating step and said intercalating step are carried out simultaneously.
Claim 7
Dependent Claim
17 words
The method of claim 3 wherein said intercalating step is carried out subsequent to said boronating step.
Claim 8
Dependent Claim
26 words
The method of claim 3, wherein said boronating step is carried out with elemental boron, BCl 3 , or boranes, or water soluble compounds of boron.
Claim 9
Dependent Claim
18 words
The method of claim 3 wherein said intercalating step is carried out using CaNCN or CaCl 2 .
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |