Patent US2544472A successfully refreshed from Google Patents.
US2544472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of diborane
Assignee: Individual
•
Filing: 1945-02-06
•
Granted: 1951-03-06
•
Expires: 1965-02-06
Abstract
No abstract record available.
Inventors
- 👤 Hermann I Schlesinger
- 👤 Herbert C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:55
CPC Classifications
C; C01; C01B; C01B6/00; C01B6/06; C01B6/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
A PROCESS OF PREPARING DIBORANE WHICH COMPRISES REACTING AN ALKALI METAL HYDRIDE AND A BORON HALIDE.
Claim 2
Dependent Claim
16 words
A PROCESS OF PREPARING DIBORANE WHICH COMPRISES REACTING AN ALKALI METAL HYDRIDE AND A BORON HALIDE.
Claim 3
Dependent Claim
55 words
IN THE PREAPRATION OF DIBORANE, THE STEPS WHICH COMPRISE BEINGING TOGETHER FINELY DIVIDED LITHIUM HYDRIDE AND BORON FLUORIDE IN THE PRESENCE OF ETHYL ETHER, HEATING THE ETHER TO EXPEL THE RESULTING DIBORANE, SUBJECTING THE DISTILLATE TO A CONDENSING TEMPERATURE TO SEPARATE ETHER AND FLUORIDE FROM THE DIBORANE, AND REMOVING THE DIBORANE FROM THE CONDENSING ZONE.
Claim 4
Dependent Claim
55 words
IN THE PREAPRATION OF DIBORANE, THE STEPS WHICH COMPRISE BEINGING TOGETHER FINELY DIVIDED LITHIUM HYDRIDE AND BORON FLUORIDE IN THE PRESENCE OF ETHYL ETHER, HEATING THE ETHER TO EXPEL THE RESULTING DIBORANE, SUBJECTING THE DISTILLATE TO A CONDENSING TEMPERATURE TO SEPARATE ETHER AND FLUORIDE FROM THE DIBORANE, AND REMOVING THE DIBORANE FROM THE CONDENSING ZONE.
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) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |