Patent US2590544A successfully refreshed from Google Patents.
US2590544A
Expired / Lapsed
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Process for the crystallization of ddt
Assignee: Montrose Chemical Corp
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Filing: 1949-04-19
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Granted: 1952-03-25
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Expires: 1969-04-19
Abstract
No abstract record available.
Inventors
- 👤 John L Kallok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:11
CPC Classifications
C; C07; C07C; C07C25/00; C07C25/18; C07C25/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE PROCESS OF SOLIDIFYING DDT TO A HARD CRYSTALLINE FORM WHICH CONSISTS ESSENTIALLY IN CONTINUOUSLY COOLING MOLTEN DDT IN THE FORM OF A FILM FROM A TEMPERATURE ABOVE ITS SETTING POINT TO A FINAL TEMPERATURE BETWEEN 5* C. AND 30* C., TO EFFECT, INITIALLY, FORMATION OF A MULTITUDE OF CRYSTAL NUCLEI IN THE LIQUID AND, FINALLY FORMATION OF A FIRM AND, SIMULTANEOUSLY AND CONTINUOUSLY DURING SUCH CONTINUOUS COOLING, WORKING THE DDT IN THE FORM OF A FILM UNTIL THE DDT ATTAINS SAID FINAL TEMPERATURE AND IS OF A HARD CRYSTALLINE FORM.
Claim 2
Dependent Claim
91 words
THE PROCESS OF SOLIDIFYING DDT TO A HARD CRYSTALLINE FORM WHICH CONSISTS ESSENTIALLY IN CONTINUOUSLY COOLING MOLTEN DDT IN THE FORM OF A FILM FROM A TEMPERATURE ABOVE ITS SETTING POINT TO A FINAL TEMPERATURE BETWEEN 5* C. AND 30* C., TO EFFECT, INITIALLY, FORMATION OF A MULTITUDE OF CRYSTAL NUCLEI IN THE LIQUID AND, FINALLY FORMATION OF A FIRM AND, SIMULTANEOUSLY AND CONTINUOUSLY DURING SUCH CONTINUOUS COOLING, WORKING THE DDT IN THE FORM OF A FILM UNTIL THE DDT ATTAINS SAID FINAL TEMPERATURE AND IS OF A HARD CRYSTALLINE FORM.
References Cited (Backward Citations)
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Cited
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Cited
US2200774A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |