Patent US2931710A successfully refreshed from Google Patents.
US2931710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of phosgene from boron trihalides
Assignee: Stauffer Chemical Co
•
Filing: 1956-12-14
•
Granted: 1960-04-05
•
Expires: 1976-12-14
Abstract
No abstract record available.
Inventors
- 👤 Amos J Leffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:42
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE PROCESS OF PURIFYING A MEMBER SELECTED FROM THE GROUP CONSISTING OF BORON TRIBROMIDE AND BORON TRICHLORIDE CONTAINING A SMALL PERCENTAGE OF PHOSGENE COMPRISING PASSING THE MEMBER AT A TEMPERATURE OF BETWEEN ABOUT 400*C. AND 500*C. OVER METALLIC COPPER AT A TEMPERATURE OF BETWEEN ABOUT 400*C. 500*C.
Claim 2
Dependent Claim
47 words
THE PROCESS OF PURIFYING A MEMBER SELECTED FROM THE GROUP CONSISTING OF BORON TRIBROMIDE AND BORON TRICHLORIDE CONTAINING A SMALL PERCENTAGE OF PHOSGENE COMPRISING PASSING THE MEMBER AT A TEMPERATURE OF BETWEEN ABOUT 400*C. AND 500*C. OVER METALLIC COPPER AT A TEMPERATURE OF BETWEEN ABOUT 400*C. 500*C.
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |