Patent US2547689A successfully refreshed from Google Patents.
US2547689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of trichloromethyl disubstituted methanes
Assignee: EIDP Inc
•
Filing: 1945-10-19
•
Granted: 1951-04-03
•
Expires: 1965-10-19
Abstract
No abstract record available.
Inventors
- 👤 Oliver W Cass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:26
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/2637
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
IN THE MANUFACTURE OF TRICHLOROMETHYL DISUBSTITUTED METHANE, THE STEP COMPRISING CONDENSING CHLORAL INTERMEDIATE WITH A SUBSTITUTED BENZENE COMPOUND HAVING REPLACEABLE HYDROGEN IN THE PRESENCE OF SULFURIC ACID OF DEHYDRATING STRENGTH.
Claim 2
Dependent Claim
30 words
IN THE MANUFACTURE OF TRICHLOROMETHYL DISUBSTITUTED METHANE, THE STEP COMPRISING CONDENSING CHLORAL INTERMEDIATE WITH A SUBSTITUTED BENZENE COMPOUND HAVING REPLACEABLE HYDROGEN IN THE PRESENCE OF SULFURIC ACID OF DEHYDRATING STRENGTH.
References Cited (Backward Citations)
US774151A
Cited
US2329074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |