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US2883428A
Expired / Lapsed
US
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Preparation of 1,1-dichloro-2,2-diphenylethanes
Assignee: Rohm and Haas Co
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Filing: 1957-10-03
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Granted: 1959-04-21
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Expires: 1977-10-03
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Nemec
- 👤 Charles H Mckeever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:24
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/093; C07C17/16; C07C17/263
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A PROCESS FOR PREPARING COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
8 words
A PROCESS FOR PREPARING COMPOUNDS OF THE FORMULA
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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |