Patent US2518692A successfully refreshed from Google Patents.
US2518692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing aromatic esters of phosphoric acid
Assignee: Eastman Kodak Co
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Filing: 1947-07-11
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Granted: 1950-08-15
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Expires: 1967-07-11
Abstract
No abstract record available.
Inventors
- 👤 David C Hull
- 👤 Jerry R Snodgrass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:28
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A METHOD OF MAKING AROMATIC ESTERS OF PHOSPHORIC ACID WHICH COMPRISES HEATING ONE MOLAR PROPORTION OF P2O5 WITH AT LEAST THREE MOLAR PROPORTIONS OF A SYMMETRICAL AROMATIC ETHER HAVING THE FORMULA ROR WHEREIN R REPRESENTS AN AROMATIC HYDROCARBON RADICAL AT A TEMPERATURE WITHIN THE RANGE OF 50-180*, THE TOTAL HEATING BEING EFFECTED FOR A SUFFICIENT TIME TO FORM A SUBSTANTIAL AMOUNT OF NEUTRAL AROMATIC ORTHOPHOSPHATE ESTER (RO)3PO, WHEREIN R HAS THE ABOVEDEFINED MEANING.
Claim 2
Independent Claim
73 words
A METHOD OF MAKING AROMATIC ESTERS OF PHOSPHORIC ACID WHICH COMPRISES HEATING ONE MOLAR PROPORTION OF P2O5 WITH AT LEAST THREE MOLAR PROPORTIONS OF A SYMMETRICAL AROMATIC ETHER HAVING THE FORMULA ROR WHEREIN R REPRESENTS AN AROMATIC HYDROCARBON RADICAL AT A TEMPERATURE WITHIN THE RANGE OF 50-180*, THE TOTAL HEATING BEING EFFECTED FOR A SUFFICIENT TIME TO FORM A SUBSTANTIAL AMOUNT OF NEUTRAL AROMATIC ORTHOPHOSPHATE ESTER (RO)3PO, WHEREIN R HAS THE ABOVEDEFINED MEANING.
References Cited (Backward Citations)
US2407279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |