Patent US115894A successfully refreshed from Google Patents.
US4094897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-bonded graphite body for a dry cell
Assignee: Panasonic Holdings Corp
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Filing: 1976-08-03
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Granted: 1978-06-13
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Expires: 1996-08-03
Abstract
Abstract A resin-bonded graphite body having controlled crystalline orientation and a density of at least 2.05 g/cm3, the body comprising 3 to 12 weight % of a thermosetting resin and 88 to 97 weight % of a carbonaceous powder which includes at least 50 weight % of natural crystalline graphite powder, is provided. The body has a high transverse strength and a very low electrical resistance in the direction parallel to the direction of the crystalline orientation, and is thus suitable for a dry battery electrode.
Inventors
- 👤 Masahiro Nagasawa
- 👤 Tomio Ishida
- 👤 Yoshitaka Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:22
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/668; A; A61; A61P; A61P3/00; A61P3/08; A61P3/10; C; C01; C01B; C01B32/00; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C07; C07C; C07C251/00; C07C251/72; H01B; H01B1/00; H01B1/04; H01M4/663; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
A method of making a resin-bonded graphite body, comprising: uniformly mixing, to form a dry powder mixture, 3 to 12 weight % of a thermosetting resin and 88 to 97 weight % of a carbonaceous powder which includes at least 50 weight % of natural crystalline graphite particles, compressing said dry mixture by a first uniaxial pressure into a compressed powder rod having crystalline orientation; inserting said compressed powder rod into a hollow of a mold which has a shape similar to the shape of said compressed powder rod; pre-heating the thus inserted powder rod to the softening temperature of said thermosetting resin; compressing the thus pre-heated rod by a second uniaxial pressure, the direction of which is perpendicular to the direction of said first uniaxial pressure and parallel to the direction of the length of said powder rod as well as to the basal plane of said crystalline graphite particles; heating said rod to the curing temperature of said thermosetting resin so as to harden said thermosetting resin, said orientation being maintained after said curing; and removing the thus treated rod from said mold.
Claim 2
Independent Claim
185 words
A method of making a resin-bonded graphite body, comprising: uniformly mixing, to form a dry powder mixture, 3 to 12 weight % of a thermosetting resin and 88 to 97 weight % of a carbonaceous powder which includes at least 50 weight % of natural crystalline graphite particles, compressing said dry mixture by a first uniaxial pressure into a compressed powder rod having crystalline orientation; inserting said compressed powder rod into a hollow of a mold which has a shape similar to the shape of said compressed powder rod; pre-heating the thus inserted powder rod to the softening temperature of said thermosetting resin; compressing the thus pre-heated rod by a second uniaxial pressure, the direction of which is perpendicular to the direction of said first uniaxial pressure and parallel to the direction of the length of said powder rod as well as to the basal plane of said crystalline graphite particles; heating said rod to the curing temperature of said thermosetting resin so as to harden said thermosetting resin, said orientation being maintained after said curing; and removing the thus treated rod from said mold.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein said natural crystalline graphite has an average particle size of 50 to 150 microns.
Claim 4
Dependent Claim
13 words
A method according to claim 1, wherein said thermosetting resin is epoxy resin.
Claim 5
Dependent Claim
13 words
A method according to claim 1, wherein said thermosetting resin is xylic resin.
Claim 6
Dependent Claim
14 words
A method according to claim 1, wherein said thermosetting resin is a fine powder.
Claim 7
Dependent Claim
22 words
A method according to claim 1, wherein said powder mixture has a volume density of not more than 0.5 g/cm 3 .
Claim 8
Dependent Claim
18 words
A method according to claim 1, wherein said first uniaxial pressure is 150 to 800 kg/cm 2 .
Claim 9
Dependent Claim
22 words
A method according to claim 1, wherein said compressed powder rod has an apparent density between 1.6 and 1.8 g/cm 3 .
Claim 10
Dependent Claim
32 words
A method according to claim 1, wherein the cross-sectional area of said hollow of said mold is between 1.02 and 1.16 times as large as the cross-sectional area of said powder rod.
Claim 11
Dependent Claim
18 words
A method according to claim 1, wherein said second uniaxial pressure is 500 to 2,000 kg/cm 2 .
Claim 12
Dependent Claim
105 words
A method according to claim 1, wherein said pre-heating step and the subsequent compressing step are carried out by: pre-heating said mold and piston for said compression to a temperature not lower than said curing temperature of said thermosetting resin; inserting said powder rod in said mold; maintaining said powder rod as is, until said thermosetting resin is heated to about said softening temperature of said thermosetting resin by the heat from said pre-heated mold; inserting said piston in said mold so as to apply said second uniaxial pressure to said rod; and maintaining said rod at said second pressure to cure said thermosetting resin.
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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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |