US3624005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphite-glass compositions and method of making same
Assignee: Compagnie de Saint Gobain SA
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Filing: 1962-08-23
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Granted: 1971-11-30
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Expires: 1982-08-23
Abstract
Abstract Compositions which can be shaped, machined, polished, cut, which have the same level of conductivity as graphite even for high contents of glass, which resist oxidation much better than graphite, and which have good water resistance, are made by impregnating graphite with glass which makes with graphite, when molten, an interior angle less than 45*. These compositions are superior to both glass and graphite for many uses. The invention reveals a group of glasses which have the property of wetting graphite. These compositions are useful as electric motor brushes, bearings and rods, bars, and plates.
Inventors
- 👤 Yves Georges Godron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:25
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/00; C04B35/515; C04B35/52; H; H01; H01B; H01B1/00; H01B1/14; H01B1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A batch mixture particularly adapted to the manufacture of composite objects consisting essentially of graphite and glass, the graphite being a powder having particles less than about 50 mu. in size and the glass being a powder having particles less than about 30 mu. in size, the graphite being present from about 10 to 75 percent by volume of the glass and graphite, the glass having a viscosity less than 104 poises at 700* C. in which a drop of said glass when molten and at rest on a smooth and horizontal graphite plate has planes tangent to its surface at the circumference of contact of said surface with the superior horizontal plane of the plate making with said horizontal plane an angle interior less than 15*.
Claim 2
Dependent Claim
76 words
A glass-graphite object consisting in its essential elements of particles of graphite less than 50 mu. in size, embedded in a matrix of glass, the glass in the piece being between 90 and 25 parts by volume and the graphite being respectively between 10 and 75 parts by volume, the glass having a viscosity below 104 poises at 700* C., and having an interior contact angle with a flat graphite surface, when molten, less than 45*.
Claim 3
Dependent Claim
26 words
A glass-graphite object according to claim 3 in which the contact angle of the molten glass on a flat graphite surface is less than about 15*.
Claim 4
Independent Claim
113 words
A method of making machinable, electrically conductive, glass-graphite objects which comprises mixing 10 to 75 parts by volume of graphite with 90 to 25 parts by volume, respectively, of finely divided glass, the graphite being in particles less than 50 mu. in size, the glass having a viscosity below 104 poises at 700* C., and having an interior contact angle with a flat graphite surface, when molten, less than 45*, shaping the mixture under pressure at room temperature, molding it at agglomerating temperature under pressure, and cooling the molded object under pressure to a point below the temperature corresponding to the maximum point reached on the complete thermal expansion curve of the glass.
Claim 5
Independent Claim
79 words
A method of making machinable glass-graphite objects which comprises mixing 10 to 75 parts by volume of graphite with 90 to 25 parts by volume respectively of finely divided glass, the graphite being in particles less than 50 mu. in size, the glass having a viscosity less than 104 poises at 700* C., and having an interior contact angle with a flat graphite surface, when molten, less than 45*, shaping the mixture at agglomerating tempeRature, and cooling the object.
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |