Patent US2567227A successfully refreshed from Google Patents.
US2567227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of calcium phosphate
Assignee: Chemical Foundation Inc
•
Filing: 1948-01-28
•
Granted: 1951-09-11
•
Expires: 1968-01-28
Abstract
No abstract record available.
Inventors
- 👤 Miller Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:46
CPC Classifications
C; C05; C05B; C05B3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD OF PRODUCING DICALCIUM PHOSPHATE WHICH COMPRISES ESTABLISHING A SOLUTION OF STRONG PHOSPHORIC ACID CONTAINING SOME DISSOLVED MONOCALCIUM PHOSPHATE, FLOWING SUCH SOLUTION IN A CLOSED CIRCUIT; CONTACTING THE SOLUTION AT AN ELEVATED TEMPERATURE WITH PHOSPHATE ROCK IN ONE SECTION OF THE CIRCUIT UNDER CONDITIONS CONTROLLED TO DISSOLVE THE ROCK TO THEREBY INCREASE THE AMOUNT OF MONOCALCIUM PHOSPHATE DISSOLVED IN THE SOLUTION; FLOWING THE MONOCALCIUM PHOSPHATE-ENRICHED SOLUTION TO ANOTHER SECTION OF THE CIRCUIT AND THERE REDUCING THE TEMPERATURES SUFFICIENTLY TO CRYSTALLIZE A PORTION OF THE DISSOLVED MONOCALCIUM PHOSPHATE, SEPARATING THE SOLID MONOCALCIUM PHOSPHATE FROM THE SOLUTION, HYDROLYZING THE SEPARATED SOLID MONOCALCIUM PHOSPHATE TO DICALCIUM PHOSPHATE AND PHOSPHORIC ACID AND FURTHER CONTACTING THE MONOCALCIUM PHOSPHATE-DEPLETED SOLUTION WITH PHOSPHATE ROCK IN THE CIRCUIT AND INTRODUCING THE PHOSPHORIC ACID PRODUCED IN THE HYDROLYZING STEP INTO THE SAID CIRCUIT.
Claim 2
Independent Claim
135 words
A METHOD OF PRODUCING DICALCIUM PHOSPHATE WHICH COMPRISES ESTABLISHING A SOLUTION OF STRONG PHOSPHORIC ACID CONTAINING SOME DISSOLVED MONOCALCIUM PHOSPHATE, FLOWING SUCH SOLUTION IN A CLOSED CIRCUIT; CONTACTING THE SOLUTION AT AN ELEVATED TEMPERATURE WITH PHOSPHATE ROCK IN ONE SECTION OF THE CIRCUIT UNDER CONDITIONS CONTROLLED TO DISSOLVE THE ROCK TO THEREBY INCREASE THE AMOUNT OF MONOCALCIUM PHOSPHATE DISSOLVED IN THE SOLUTION; FLOWING THE MONOCALCIUM PHOSPHATE-ENRICHED SOLUTION TO ANOTHER SECTION OF THE CIRCUIT AND THERE REDUCING THE TEMPERATURES SUFFICIENTLY TO CRYSTALLIZE A PORTION OF THE DISSOLVED MONOCALCIUM PHOSPHATE, SEPARATING THE SOLID MONOCALCIUM PHOSPHATE FROM THE SOLUTION, HYDROLYZING THE SEPARATED SOLID MONOCALCIUM PHOSPHATE TO DICALCIUM PHOSPHATE AND PHOSPHORIC ACID AND FURTHER CONTACTING THE MONOCALCIUM PHOSPHATE-DEPLETED SOLUTION WITH PHOSPHATE ROCK IN THE CIRCUIT AND INTRODUCING THE PHOSPHORIC ACID PRODUCED IN THE HYDROLYZING STEP INTO THE SAID CIRCUIT.
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) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |