Patent US2663722A successfully refreshed from Google Patents.
US2663722A
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Method of preparing tetraalkyl dithionopyrophosphates
Assignee: Victor Chemical Works
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Filing: 1950-03-24
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Granted: 1953-12-22
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Expires: 1970-03-24
Abstract
No abstract record available.
Inventors
- 👤 Toy Arthur Dock Fon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:36
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C07F9/1658
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE METHOD OF PREPARING A TETRAALKYL DITHIONOPYROPHOSPHATE ESTER WHICH COMPRISES REACTING A DIALKYL CHLOROTHIONOPHOSPHATE WITH WATER AND A TERTIARY AMINE AT A TEMPERATURE BELOW 80* C. BUT ABOVE 0* C. FOR A PERIOD OF TIME SUFFICIENT TO COMPLETE THE REACTION, ANS SEPARATING THE OILY PRODUCT.
Claim 2
Independent Claim
45 words
THE METHOD OF PREPARING A TETRAALKYL DITHIONOPYROPHOSPHATE ESTER WHICH COMPRISES REACTING A DIALKYL CHLOROTHIONOPHOSPHATE WITH WATER AND A TERTIARY AMINE AT A TEMPERATURE BELOW 80* C. BUT ABOVE 0* C. FOR A PERIOD OF TIME SUFFICIENT TO COMPLETE THE REACTION, ANS SEPARATING THE OILY PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |