Patent US4863173A successfully refreshed from Google Patents.
US3014784A
Expired / Lapsed
US
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Making ferric pyrophosphate hydrate
Assignee: American Oil Co
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Filing: 1958-10-20
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Granted: 1961-12-26
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Expires: 1978-10-20
Abstract
No abstract record available.
Inventors
- 👤 Harmon M Knight
- 👤 Joe T Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:28
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/60; B; B01; B01J; B01J27/00; B01J27/06; B01J27/14; B01J27/185; B01J27/1853; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF PREPARING A FERRIC PYROPHOSPATE HYDRATE, WHICH METHOD COMPRISES REACTING A WATER SOLUBLE FERRIC SALT AND A WATER SOLUBLE METAL PYROPHOSPHATE, IN WATER SOLUTION, TO PRODUCE A PRECIPITATE OF FERRIC PYROPHOSPHATE HYDRATE, WHEREIN SAID FERRIC SALT IS ADDED IN AN AMOUNT BETWEEN ABOUT 10% AND 100% IN EXCESS OF THE THEORETICAL REQUIREMENT, WATER-WASHING SAID PRECIPITATE TO REMOVE OCCLUDED REACTION SOLUTION AND DRYING SAID WASHED FERRIC PYROPHOSPHATE HYDRATE AT A TEMPERATURE BELOW ABOUT 110*C. TO OBTAIN A HYDRATE PRODUCT HAVING A TOTAL WATER CONTENT BETWEEN ABOUT 11 AND 19 WEIGHT PERCENT.
Claim 2
Independent Claim
92 words
A METHOD OF PREPARING A FERRIC PYROPHOSPATE HYDRATE, WHICH METHOD COMPRISES REACTING A WATER SOLUBLE FERRIC SALT AND A WATER SOLUBLE METAL PYROPHOSPHATE, IN WATER SOLUTION, TO PRODUCE A PRECIPITATE OF FERRIC PYROPHOSPHATE HYDRATE, WHEREIN SAID FERRIC SALT IS ADDED IN AN AMOUNT BETWEEN ABOUT 10% AND 100% IN EXCESS OF THE THEORETICAL REQUIREMENT, WATER-WASHING SAID PRECIPITATE TO REMOVE OCCLUDED REACTION SOLUTION AND DRYING SAID WASHED FERRIC PYROPHOSPHATE HYDRATE AT A TEMPERATURE BELOW ABOUT 110*C. TO OBTAIN A HYDRATE PRODUCT HAVING A TOTAL WATER CONTENT BETWEEN ABOUT 11 AND 19 WEIGHT PERCENT.
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) | 1964-12-25 | 1965-06-26 | 1965-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-25 | 1969-06-26 | 1969-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-25 | 1973-06-26 | 1973-12-26 | $7700.00 | Window Closed / Lapsed |