Patent US3414381A successfully refreshed from Google Patents.
US3414381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing low density graphite structures
Assignee: Dow Chemical Co
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Filing: 1966-04-04
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Granted: 1968-12-03
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Olstowski Franciszek
- 👤 Sr John D Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:28
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR THE PREPARATION OF RELATIVELY LOW DENSITY GRAPHITE COMPACTS WHICH COMPRISES (A) TREATING VERMICULAR GRAPHITE WITH AN EXPANDING AGENT, (B) COMPRESSING THE TREATED VERMICULAR GRAPHITE INTO AN INTEGRAL COMPACT HAVING A DENSITY F AT LEAST 0.3 GM./C.C., AND (C) TREATING SUCH COMPACT WITH A PEROXIDE SOLUTION FOR A PERIOD SUFFICIENT TO PRODUCE EXPANSION OF SUCH COMPACT.
Claim 2
Dependent Claim
58 words
A PROCESS FOR THE PREPARATION OF RELATIVELY LOW DENSITY GRAPHITE COMPACTS WHICH COMPRISES (A) TREATING VERMICULAR GRAPHITE WITH AN EXPANDING AGENT, (B) COMPRESSING THE TREATED VERMICULAR GRAPHITE INTO AN INTEGRAL COMPACT HAVING A DENSITY F AT LEAST 0.3 GM./C.C., AND (C) TREATING SUCH COMPACT WITH A PEROXIDE SOLUTION FOR A PERIOD SUFFICIENT TO PRODUCE EXPANSION OF SUCH COMPACT.
References Cited (Backward Citations)
GB991581A
Cited
US3357929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |