Patent US2495220A successfully refreshed from Google Patents.
US2495220A
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Method of preparing phosphate esters
Assignee: Eastman Kodak Co
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Filing: 1946-12-26
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Granted: 1950-01-24
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Expires: 1966-12-26
Abstract
No abstract record available.
Inventors
- 👤 Bell Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:24
CPC Classifications
A; A01; A01N; A01N57/00; A01N57/10; A01N57/12; C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/098
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A PROCESS FOR PREPARING A REACTION PRODUCT HAVING USEFUL INSECTICIDE PROPERTIES WHICH COMPRISES HEATING A REACTION MIXTURE CONSISTING ESSENTIALLY OF A PHOSPHATE FROM THE GROUP CONSISTING OF THE LOWER ALKYL PHOSPHATES AND THE LOWER ALKYL THIOPHOSPHATES, AND AT LEAST ONE SULFUR ACID HALIDE FROM THE GROUP CONSISTING OF THIONYL CHLORIDE, SULFURYL CHLORIDE, THIONYL BROMIDE AND SULFURYL BROMIDE, SAID PHOSPHATE BEING PRESENT IN SAID REACTION MIXTURE IN A GREATER MOLAR AMOUNT THAN SAID ACID HALIDE, AND SAID HEATING BEING SUFFICIENT TO CAUSE REACTION AND TO LIBERATE FROM THE REACTION A MAJOR PART OF ALL OF THE SULFUR AND HALOGEN CONTAINED IN SAID SULFUR ACID HALIDE.
References Cited (Backward Citations)
US2242260A
Cited
US2370786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |