Patent US606639A successfully refreshed from Google Patents.
Patent US2610213A successfully refreshed from Google Patents.
US2610213A
Expired / Lapsed
US
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Manufacture of ddt
Assignee: EIDP Inc
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Filing: 1945-11-29
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Granted: 1952-09-09
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Expires: 1965-11-29
Abstract
No abstract record available.
Inventors
- 👤 Norman E Searle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:06
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/2637
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN THE MANUFACTURE OF DDT, THE STEPS COMPRISING CONDENSING CHORAL AND MONO-CHLORIBENSZENE WHILE A LIQUID MIXTURE OF THE CHIORAL AND MONO-CHLOROBENZENE IN THE PROPORTIONS OF AT LEAST 2.2 MOLES OF MONO-CHLOROBENZENE FOR EACH MOLE OF CHLORAL IS EMULSIFIED IN A SUFFICIENT AMOUNT OF SULFURIC ACID OF ABOUT 95% AND NOT MORE THAN 98% STRENGTH TO EMULSIFY ALL OF THE MIXTURE, EFFECTING COOLING AS REQUIRED TO MAINTAIN THE SULTEMPERATURE FROM ABOUT 10*C. TO ABOUT 40* C. ADDING OLEUM AS REQUIRED TO MAINTAIN THE SULFURIC ACID AT THIS STRENGTH, AND ADDING MONOCHLOROBENZENE AS REQUIRED TO PREVENT SEPARATION OF THE SOLID PHASE.
Claim 2
Dependent Claim
99 words
IN THE MANUFACTURE OF DDT, THE STEPS COMPRISING CONDENSING CHORAL AND MONO-CHLORIBENSZENE WHILE A LIQUID MIXTURE OF THE CHIORAL AND MONO-CHLOROBENZENE IN THE PROPORTIONS OF AT LEAST 2.2 MOLES OF MONO-CHLOROBENZENE FOR EACH MOLE OF CHLORAL IS EMULSIFIED IN A SUFFICIENT AMOUNT OF SULFURIC ACID OF ABOUT 95% AND NOT MORE THAN 98% STRENGTH TO EMULSIFY ALL OF THE MIXTURE, EFFECTING COOLING AS REQUIRED TO MAINTAIN THE SULTEMPERATURE FROM ABOUT 10*C. TO ABOUT 40* C. ADDING OLEUM AS REQUIRED TO MAINTAIN THE SULFURIC ACID AT THIS STRENGTH, AND ADDING MONOCHLOROBENZENE AS REQUIRED TO PREVENT SEPARATION OF THE SOLID PHASE.
References Cited (Backward Citations)
US2329074A
Cited
US2464265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |