US3829327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon paper
Assignee: KREHA CORP
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Filing: 1972-07-03
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Granted: 1974-08-13
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Expires: 1992-07-03
Abstract
Abstract AN ELECTRICALLY CONDUCTIVE, CHEMICALLY INERT, POROUS STRUCTURALLY COHERENT WEB OF CARBON FIBRES WHICH HAS A CARBON COATING THEREON. THE CARBON COATINGS ON THE RESPECTIVE CARBON FIBRES ARE INTERGROWN WITH ONE ANOTHER AT THOSE LOCATIONS WHERE THE COATED FIBRES CONTACT ONE ANOTHER. AT LEAST ABOUT FIFTY PERCENT OF THE VOLUME IN THE WEB IS VOID OF COATED FIBRES.
Inventors
- 👤 T Omori
- 👤 H Imaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; D; D21; D21H; D21H13/00; D21H13/36; D21H13/46; D21H13/50; H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/663; H01M4/668; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |