Patent US3429553A successfully refreshed from Google Patents.
US2921087A
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Process for producing dialkyl phosphoric acids
Assignee: Eastman Kodak Co
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Filing: 1957-12-19
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Granted: 1960-01-12
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Expires: 1977-12-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry W Coover
- 👤 Marvin A Mccall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:31
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE IMPROVED METHOD FOR PRODUCING A DIALKYL PHOSPHORIC ACID HIGH PURITY WHICH COMPRISES REACTING A DIALKYL HYDROGEN PHOSPHITE, WHEREIN THE ALKYL RADICALS CONTAIN FROM 1-10 CARBON ATOMS, WITH NITROGEN DIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF 0-200* C.
Claim 2
Dependent Claim
39 words
THE IMPROVED METHOD FOR PRODUCING A DIALKYL PHOSPHORIC ACID HIGH PURITY WHICH COMPRISES REACTING A DIALKYL HYDROGEN PHOSPHITE, WHEREIN THE ALKYL RADICALS CONTAIN FROM 1-10 CARBON ATOMS, WITH NITROGEN DIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF 0-200* C.
References Cited (Backward Citations)
US2059084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |