Patent US3356525A successfully refreshed from Google Patents.
US3356525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal carbide formation on carbon fibers
Assignee: HITCO Corp
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Filing: 1963-11-18
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Granted: 1967-12-05
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Expires: 1983-11-18
Abstract
No abstract record available.
Inventors
- 👤 Carlos L Gutzeit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:00
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/52; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/126
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD OF IMPROVING THE OXIDATION RESISTANCE OF AMORPHOUS CARBON FIBERS, WHICH METHOD COMPRISES COVERING THE SURFACES OF CARBON FIBERS WITH AND BONDING TO SAID SURFACES A LAYER OF HEAT DECOMPOSABLE ORGANIC MATERIAL CONTAINING CARBON AND METAL SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, CHROMIUM, NICKEL, TITANIUM, AND MIXTURES THEREOF, SAID CARBON FIBERS HAVING BEEN HEAR SHRUNK AT ABOUT 1800-2200* F., AND THEREAFTER DECOMPOSING SAID MATERIAL UNDER NON-OXIDIZING CONDITIONS AND AT ELEVATED TEMPERATURES TO CARBINE OF SAID METAL WHILE SUBSTANTIALLY PERSERVING THE CARBON OF SAID FIBER, SAID TEMPERATURE BEING BELOW THAT AT WHICH GRAPHITIZATION OCCURS, WHEREBY SAID FIBERS HAVE IMPROVED OXIDATION RESISTANCE AT TEMPERATURES IN EXCESS OF 800* F.
Claim 2
Independent Claim
109 words
A METHOD OF IMPROVING THE OXIDATION RESISTANCE OF AMORPHOUS CARBON FIBERS, WHICH METHOD COMPRISES COVERING THE SURFACES OF CARBON FIBERS WITH AND BONDING TO SAID SURFACES A LAYER OF HEAT DECOMPOSABLE ORGANIC MATERIAL CONTAINING CARBON AND METAL SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, CHROMIUM, NICKEL, TITANIUM, AND MIXTURES THEREOF, SAID CARBON FIBERS HAVING BEEN HEAR SHRUNK AT ABOUT 1800-2200* F., AND THEREAFTER DECOMPOSING SAID MATERIAL UNDER NON-OXIDIZING CONDITIONS AND AT ELEVATED TEMPERATURES TO CARBINE OF SAID METAL WHILE SUBSTANTIALLY PERSERVING THE CARBON OF SAID FIBER, SAID TEMPERATURE BEING BELOW THAT AT WHICH GRAPHITIZATION OCCURS, WHEREBY SAID FIBERS HAVE IMPROVED OXIDATION RESISTANCE AT TEMPERATURES IN EXCESS OF 800* F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |