US3816598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for surface treatment of graphite fibers
Assignee: Lockheed Martin Corp
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Filing: 1972-04-06
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Granted: 1974-06-11
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Expires: 1992-04-06
Abstract
Abstract A PROCESS FOR THE SURFACE TREATMENT OF INTERMEDIATE AND HIGH MODULUS GRAPHITE OR CARBON FIBER BY SUBJECTING THE FIBER TO A NON-AQUEOUS GASEOUS ATMOSPHERE OF OXYGEN IN AN INERT CARRIER GASEOUS MEDIUM AT AN ELEVATED TEMPRATURE. PROPER SELCTION OF THE CONCENTRATION OF OXYGEN AND OF THE TEMPERATURE INCREASES THE INTERLAMINAR SHEAR STRENGTH OF A GRAPHITE FIBER-RESIN COMPOSITE WITH MINIMAL WEIGHT LOSS OF THE FIBER AND MINIMAL DEGRADING (IF ANY) THE TENSILE PROPERTIES OF THE FIBER.
Inventors
- 👤 A Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:50
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/122; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |