US2734801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brooks
Assignee: —
•
Filing: —
•
Granted: 1956-02-14
•
Expires: 1973-02-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:36
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/20; C01B32/21; C01B32/215
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD OF REMOVING BORON TO SUCH AN EXTENT FROM A GRAPHITE ARTICLE THAT A SPECTROGRAPHIC ANALYSIS OF THE TREATED ARTICLE INDICATES THE TOTAL ABSENCE OF BORON, WHICH COMPRISES THE STEPS OF HEATING THE GRAPHITE ARTICLE TO A TEMPERATURE ABOVE THE DISSOCIATION TEMPERATURE OF DICHLORODIFLUOROMETHANE, BRINGING SAID DICHLORO-DIFLUROROMETHANE INTO REACTION WITH SAID GRAPHITE ARTICLE TO LIBERATE FLUORINE WHICH REACTS WITH THE BORON IN THE GRAPHITE ARTICLE, AND PASSING OFF THE LAST MENTIONED REACTIO PRODUCTS AS A VOLATILE COMPOUND.
Claim 2
Independent Claim
78 words
A METHOD OF REMOVING BORON TO SUCH AN EXTENT FROM A GRAPHITE ARTICLE THAT A SPECTROGRAPHIC ANALYSIS OF THE TREATED ARTICLE INDICATES THE TOTAL ABSENCE OF BORON, WHICH COMPRISES THE STEPS OF HEATING THE GRAPHITE ARTICLE TO A TEMPERATURE ABOVE THE DISSOCIATION TEMPERATURE OF DICHLORODIFLUOROMETHANE, BRINGING SAID DICHLORO-DIFLUROROMETHANE INTO REACTION WITH SAID GRAPHITE ARTICLE TO LIBERATE FLUORINE WHICH REACTS WITH THE BORON IN THE GRAPHITE ARTICLE, AND PASSING OFF THE LAST MENTIONED REACTIO PRODUCTS AS A VOLATILE COMPOUND.
References Cited (Backward Citations)
US1303362A
Cited
US733389A
Cited
US1062431A
Cited
US1380458A
Cited
US2149671A
Cited
US2315346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-13 | 1959-08-15 | 1960-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-13 | 1963-08-15 | 1964-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-13 | 1967-08-15 | 1968-02-14 | $7700.00 | Window Closed / Lapsed |