US2788374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing dichlorodiphenyldichloroethane
Assignee: Honeywell International Inc
•
Filing: 1953-11-24
•
Granted: 1957-04-09
•
Expires: 1973-11-24
Abstract
No abstract record available.
Inventors
- 👤 Robert H Stair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:49
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/2637
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A PROCESS FOR PREPARING DICHLORODIPHENYLDICHLOROETHANE BY THE CONDENSATION OF MONOCHLOROBENZENE AND DICHLOROACETALDEHYDE, THE STEP WHICH COMPRISES REACTING, IN THE PRESENCE OF A CONDENSING AGENT, A MIXTURE OF DICHLOROACETALDEHYDE AND TRICHLOROACETALDEHYDE CONTAINING AT LEAST ABOUT 70% OF DICHLOROACETALDEHYDE AND IN EXCESS OF ABOUT 8% BUT NOT MORE THAN ABOUT 25% OF TRICHLOROACETALDEHYDE, WITH QUANTITY OF MONOCHLOROBENZENE SUFFICIENT TO PROVIDE, IN A FORM AVAILABLE TO REACT WITH SAID MIXTURE, NOT SUBSTANTIALLY IN EXCESS OF ONE MOLE EQUIVALENT OF MONOCHLOROBENZENE PER MOLE OF DICHLOROACETALDEHYDE IN THE MIXTURE.
Claim 2
Dependent Claim
85 words
IN A PROCESS FOR PREPARING DICHLORODIPHENYLDICHLOROETHANE BY THE CONDENSATION OF MONOCHLOROBENZENE AND DICHLOROACETALDEHYDE, THE STEP WHICH COMPRISES REACTING, IN THE PRESENCE OF A CONDENSING AGENT, A MIXTURE OF DICHLOROACETALDEHYDE AND TRICHLOROACETALDEHYDE CONTAINING AT LEAST ABOUT 70% OF DICHLOROACETALDEHYDE AND IN EXCESS OF ABOUT 8% BUT NOT MORE THAN ABOUT 25% OF TRICHLOROACETALDEHYDE, WITH QUANTITY OF MONOCHLOROBENZENE SUFFICIENT TO PROVIDE, IN A FORM AVAILABLE TO REACT WITH SAID MIXTURE, NOT SUBSTANTIALLY IN EXCESS OF ONE MOLE EQUIVALENT OF MONOCHLOROBENZENE PER MOLE OF DICHLOROACETALDEHYDE IN THE MIXTURE.
References Cited (Backward Citations)
FR902871A
Cited
US2464600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |