US3399252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for manufacture of high strength and high modulus carbon filaments
Assignee: United States Department of the Air Force
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Filing: 1966-04-15
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Granted: 1968-08-27
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Expires: 1986-04-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Hough
- 👤 Robert T Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD FOR THE CONTINUOUS MANUFACTURE OF FLEXIBLE, YET HIGH STRENGTH, HIGH MODULUS CARBON FILAMENTS COMPRISING CONTINUOUSLY MOVING A PRE-FORMED PYROLYZED POLYMERIC STRAND THROUGH A GLOW-DISCHARGE TUBE WITHIN WHICH IS POSITIONED AT LEAST ONE ELECTRICALLY ENERGIZED SECONDARY ELECTRODE, ELECTRICALLY ENERGIZING SAID STRAND TO ACT AS A PRIMARY ELECTRODE WHEREBY THE ATMOSPHERE WITHIN SAID TUBE BETWEEN SAID SECONDARY ELECTRODE AND SAID STRAND WILL TRANSMIT AN ELECTRIC CURRENT AND HEAT SAID STRAND TO ITS
Claim 2
Independent Claim
72 words
A METHOD FOR THE CONTINUOUS MANUFACTURE OF FLEXIBLE, YET HIGH STRENGTH, HIGH MODULUS CARBON FILAMENTS COMPRISING CONTINUOUSLY MOVING A PRE-FORMED PYROLYZED POLYMERIC STRAND THROUGH A GLOW-DISCHARGE TUBE WITHIN WHICH IS POSITIONED AT LEAST ONE ELECTRICALLY ENERGIZED SECONDARY ELECTRODE, ELECTRICALLY ENERGIZING SAID STRAND TO ACT AS A PRIMARY ELECTRODE WHEREBY THE ATMOSPHERE WITHIN SAID TUBE BETWEEN SAID SECONDARY ELECTRODE AND SAID STRAND WILL TRANSMIT AN ELECTRIC CURRENT AND HEAT SAID STRAND TO ITS
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |