US3867191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon-boron surfaced carbon filament
Assignee: RTX Corp
•
Filing: 1972-02-24
•
Granted: 1975-02-18
•
Expires: 1992-02-24
Abstract
Abstract A high strength composite filament suitable for use as a reinforcement in metal matrices comprises a filamentary carbon substrate having a continuous essentially amorphous carbon alloy coating adhered thereto, the coating consisting essentially of approximately 43-60 atomic percent carbon, remainder boron.
Inventors
- 👤 Francis S Galasso
- 👤 Richard D Veltri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:27
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/298
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A COMPOSITE FILAMENT AT LEAST TWO MILS IN DIAMETER HAVING A TENSILE STRENGTH OF AT LEAST 150,000 PSI FOR USE AS REINFORCEMENT IN METAL MATRIX COMPOSITE ARTICLES COMPRISING: A SUBSTRATE CONSISTING ESSENTIALLY OF CARBON FILAMENT; A CONTINUOUS COATING ADHERED TO SAID SUBSTRATE CONSISTING ESSENTIALLY OF CARBON-BORON ALLOY, SAID COATING CONSISTING ESSENTIALLY OF APPROXIMATELY 43-60 ATOMIC PERCENT CARBON, REMAINDER BORON.
Claim 2
Dependent Claim
59 words
A COMPOSITE FILAMENT AT LEAST TWO MILS IN DIAMETER HAVING A TENSILE STRENGTH OF AT LEAST 150,000 PSI FOR USE AS REINFORCEMENT IN METAL MATRIX COMPOSITE ARTICLES COMPRISING: A SUBSTRATE CONSISTING ESSENTIALLY OF CARBON FILAMENT; A CONTINUOUS COATING ADHERED TO SAID SUBSTRATE CONSISTING ESSENTIALLY OF CARBON-BORON ALLOY, SAID COATING CONSISTING ESSENTIALLY OF APPROXIMATELY 43-60 ATOMIC PERCENT CARBON, REMAINDER BORON.
Claim 3
Dependent Claim
30 words
The composite filament of claim 1 wherein said carbon filamentary substrate is at least one mil in diameter and said carbon-boron alloy coating is at least approximately 1/2 mil thick.
Claim 4
Dependent Claim
20 words
The composite filament of claim 1 wherein said alloy coating consists essentially of approximately 43-55 atomic percent carbon, remainder boron.
Claim 5
Dependent Claim
20 words
The composite filament of claim 1 wherein said alloy coating consists essentially of approximately 48 atomic percent carbon, remainder boron.
Claim 6
Dependent Claim
30 words
The composite filament of claim 3 wherein said carbon filamentary substrate is at least one mil in diameter and said carbon-boron alloy coating is at least approximately 1/2 mil thick.
Claim 7
Dependent Claim
30 words
The composite filament of claim 4 wherein said carbon filamentary substrate is at least one mil in diameter and said carbon-boron alloy coating is at least approximately 1/2 mil thick.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |