US2600378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of tetraethyl pyrophosphate
Assignee: Eastman Kodak Co
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Filing: 1950-04-14
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Granted: 1952-06-17
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Expires: 1970-04-14
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dickey
- 👤 Jr Harry W Coover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:31
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/098; A; A01; A01N; A01N57/00; A01N57/10; A01N57/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
A PROCESS OF PREPARING INSECTICIDAL ORGANIC PHOSPHORUS COMPOUNDS WHICH COMPRISES HEATING TOGETHER A TRIALKYL PHOSPHATE, THE ALKYL BEING OF 2-4 CARBON ATOMS AND ACETIC ANHYDRIDE TOGETHER WITH 0.001-0.6% OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE ETHERATE, SULFURIC ACID, BORIC ANHYDRIDE, BORIC ACID AND BUTYL BORATE, AT A TEMPERATURE WITHIN THE RANGE OF 140-205* C.
References Cited (Backward Citations)
US2495220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |