Patent US3963651A successfully refreshed from Google Patents.
US3963651A
Expired / Lapsed
US
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Method of cross linking and hardening of graphitic formed bodies
Assignee: Forschungszentrum Jülich
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Filing: 1974-12-09
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Granted: 1976-06-15
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Expires: 1994-12-09
Abstract
Abstract A method of cross-linking and hardening with the aid of heat a porous for body of a synthetic graphite or similar material, especially a fine granular graphite, which is bonded by means of a synthetic resin binding agent on a novolak basis. The thus formed porous body is a temperature of from 100°C to 200°C gassed by a quantity of formaldehyde which quantity depends on the predetermined extent of cross-linking of the formed body, while the formaldehyde is caused to pass from the outer surface of the formed body into the interior thereof.
Inventors
- 👤 Hubertus Nickel
- 👤 Hartmut Luhleich
- 👤 Francesco Dias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A method of cross-linking and hardening with the aid of heat to effect quick stabilizing of outside surface of a formed porous body of synthetic graphitic material that is bonded by means of a synthetic resin binding agent on a novolak basis, which includes in combination the steps of exclusively gassing the formed body at a temperature of from 100°C to 200°C with a quantity of formaldehyde which depends on a predetermined extent of cross-linking of said formed body, while causing said formaldehyde to advance from the outside surface of said formed body into the interior thereof.
Claim 2
Independent Claim
97 words
A method of cross-linking and hardening with the aid of heat to effect quick stabilizing of outside surface of a formed porous body of synthetic graphitic material that is bonded by means of a synthetic resin binding agent on a novolak basis, which includes in combination the steps of exclusively gassing the formed body at a temperature of from 100°C to 200°C with a quantity of formaldehyde which depends on a predetermined extent of cross-linking of said formed body, while causing said formaldehyde to advance from the outside surface of said formed body into the interior thereof.
Claim 3
Dependent Claim
27 words
A method in combination according to claim 1, which includes the step of at least partially evacuating said formed body prior to gassing the same with formaldehyde.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |