US3389964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing low density graphite structrues
Assignee: Dow Chemical Co
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Filing: 1966-04-04
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Granted: 1968-06-25
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Olstowski Franciszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/522; C04B35/536; C04B38/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR PREPARING RELATIVELY LOW DENSITY GRAPHITE STRUCTURES HAVING LOW THERMAL CONDUCTIVITIES WHICH COMPRISES COMPRESSING VERMICULAR GRAPHITE TO FORM A GRAPHITE COMPACT HAVING A DENSITY OF AT LEAST 40 LBS./FT.3, TREATING SAID COMPACT WITH AN INTTERCALCULATING AGENT, AND HEATING SAID TREATED COMPACT TO A TEMPERATURE OF BETWEEN ABOUT 100*C. AND ABOUT 500*C. TO CAUSE EXPANSION THEREOF ALONG THE AXIS OF COMPRESSION TO PRODUCE A GRAPHITE STRUCTURE HAVING A DENSITY OF BETWEEN ABOUT 5 AND 25 LBS./FT.3.
Claim 2
Dependent Claim
77 words
A PROCESS FOR PREPARING RELATIVELY LOW DENSITY GRAPHITE STRUCTURES HAVING LOW THERMAL CONDUCTIVITIES WHICH COMPRISES COMPRESSING VERMICULAR GRAPHITE TO FORM A GRAPHITE COMPACT HAVING A DENSITY OF AT LEAST 40 LBS./FT.3, TREATING SAID COMPACT WITH AN INTTERCALCULATING AGENT, AND HEATING SAID TREATED COMPACT TO A TEMPERATURE OF BETWEEN ABOUT 100*C. AND ABOUT 500*C. TO CAUSE EXPANSION THEREOF ALONG THE AXIS OF COMPRESSION TO PRODUCE A GRAPHITE STRUCTURE HAVING A DENSITY OF BETWEEN ABOUT 5 AND 25 LBS./FT.3.
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |