US3719608A
Expired / Lapsed
US
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Oxidation resistant graphite compositions
Assignee: Dow Chemical Co
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Filing: 1968-11-12
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Granted: 1973-03-06
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Expires: 1988-11-12
Abstract
Abstract This invention relates to a vermicular expanded graphite composition having enhanced oxidation resistance. Such composition comprises an admixture of vermicular graphite with from 0.5 to 10 weight percent, based on the total weight of the mixture, of an oxide of boron or phosphorus or meta borate or phosphate wherein said admixture has been compressed to a density of from 10 to 120 pounds per cubic foot.
Inventors
- 👤 F Olstowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; H; H01; H01B; H01B1/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
An oxidation resistant compressed graphite composition which comprises an intimate admixture of expanded vermicular graphite with from 0.5 to 10 weight percent, based on the total weight of the composition, of an oxidation resistant additive selected from the group consisting of the oxides of boron and phosphorous and the metal salts of borates and phosphates and mixtures thereof, said mixture compressed to a density of from 10 to 120 pounds per cubic foot.
Claim 2
Dependent Claim
73 words
An oxidation resistant compressed graphite composition which comprises an intimate admixture of expanded vermicular graphite with from 0.5 to 10 weight percent, based on the total weight of the composition, of an oxidation resistant additive selected from the group consisting of the oxides of boron and phosphorous and the metal salts of borates and phosphates and mixtures thereof, said mixture compressed to a density of from 10 to 120 pounds per cubic foot.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein the oxidation resistant additive is selected from the group consisting of B2O3, P2O5, Ca3(PO4)2, AlPO4, Zn3(PO4)2, Na2B4O7 and mixtures thereof.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the oxidation resistant additive is B2O3.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the oxidation resistant additive is Ca3(PO4)2.
Claim 6
Dependent Claim
76 words
A process for the preparation of oxidation resistant graphite compositions which comprises intimately admixing vermicular expanded graphite with from 0.5 to 10 weight percent, based on the total weight of the composition, of a particulate oxidation resistant additive selected from the group consisting of the oxides of boron and phosphorous, the metal salts of borates and phosphates and mixtures thereof and compressing the admixture to a density of from 10 to 120 pounds per cubic Foot.
Claim 7
Dependent Claim
76 words
A process for the preparation of oxidation resistant graphite compositions which comprises intimately admixing vermicular expanded graphite with from 0.5 to 10 weight percent, based on the total weight of the composition, of a particulate oxidation resistant additive selected from the group consisting of the oxides of boron and phosphorous, the metal salts of borates and phosphates and mixtures thereof and compressing the admixture to a density of from 10 to 120 pounds per cubic Foot.
Claim 8
Dependent Claim
26 words
The process according to claim 5 wherein the oxidation resistant additive is selected from the group consisting of B2O5, Ca(PO4)2, AlPO4, Zn3(PO4)2, Na2B4O7 and mixtures thereof.
Claim 9
Dependent Claim
13 words
The process according to claim 5 wherein the oxidation resistant additive is B2O3.
Claim 10
Dependent Claim
13 words
The process according to claim 5 wherein the oxidation resistant additive is Ca3(PO4)2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |