Patent US2718754A successfully refreshed from Google Patents.
Patent US2766293A successfully refreshed from Google Patents.
US2766293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2, 2-bis-(2'-hydroxy-5'-chlorophenyl)-1, 1, 1-trichloroethane
Assignee: Pennsylvania Salt Manufacturing Co
•
Filing: 1953-12-04
•
Granted: 1956-10-09
•
Expires: 1973-12-04
Abstract
No abstract record available.
Inventors
- 👤 Miville Maurice Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:40
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD OF MAKING 2,2-BIS-(2''-HYDROXY-5''-CHLOROPHENYL)-1,1,1-TRICHLOROETHANE WHICH COMPRISES REACTING CHLORAL AND P-CHLOROPHENOL WHICH ARE SUBSTANTIALLY FREE OF WATER IN A MOLAR RATIO OF ABOUT 1 TO 2 IN THE PRESENCE OF SULFURIC ACID OF ABOUT 90% TO ABOUT 100% CONCENTRATION AND CARBON TETRACHLORIDE, THE LATTER BEING PRESENT IN A RATIO OF ABOUT 1.3 TO ABOUT 2.6 MOLES PER MOLE OF CHLORAL, WHILE MAINTAINING THE TEMPERATURE WITHIN THE RANGE OF 10 TO 50* C.
Claim 2
Independent Claim
72 words
A METHOD OF MAKING 2,2-BIS-(2''-HYDROXY-5''-CHLOROPHENYL)-1,1,1-TRICHLOROETHANE WHICH COMPRISES REACTING CHLORAL AND P-CHLOROPHENOL WHICH ARE SUBSTANTIALLY FREE OF WATER IN A MOLAR RATIO OF ABOUT 1 TO 2 IN THE PRESENCE OF SULFURIC ACID OF ABOUT 90% TO ABOUT 100% CONCENTRATION AND CARBON TETRACHLORIDE, THE LATTER BEING PRESENT IN A RATIO OF ABOUT 1.3 TO ABOUT 2.6 MOLES PER MOLE OF CHLORAL, WHILE MAINTAINING THE TEMPERATURE WITHIN THE RANGE OF 10 TO 50* C.
References Cited (Backward Citations)
US1707181A
Cited
US1978949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |