Patent US2729540A successfully refreshed from Google Patents.
US2729540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing alkali metal and alkaline earth metal borohydrides
Assignee: EIDP Inc
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Filing: 1945-09-24
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Granted: 1956-01-03
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Expires: 1965-09-24
Abstract
No abstract record available.
Inventors
- 👤 Fisher Norman Gail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:04
CPC Classifications
C; C01; C01B; C01B6/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
PROCESS WHICH COMPRISES HEATING A MIXTURE OF APPROXIMATELY EQUIMOLAR AMOUNTS OF AN ALKALI METAL HYDRIDE AND A TRIALKYL BORINE WHEREIN THE ALKYL GROUPS ARE EACH OF FROM ONE TO SIX CARBON ATOMS IN THE PRESENCE OF AN INET DILUENT AT A TEMPERATURE OF AT LEAST ABOUT 200* C. BUT BELOW THE DECOMPOSITION TEMPERATURE OF THE REACTANTS AND THE BOROHYDRIDE AND UNDER A HYDROGEN PRESSURE OF AT LEAST ABOUT 1500 POUNDS PER SQUARE INCH UNTIL HYDROGEN ABSORPTION SUBSTANTIALLY CEASES AND ISOLATING THE ALKALI METAL BOROHYDRIDE.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |