Patent US3084027A successfully refreshed from Google Patents.
US3084027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification of phosphoric acid
Assignee: SMITH DOUGLASS CO Inc
•
Filing: 1960-07-01
•
Granted: 1963-04-02
•
Expires: 1980-07-01
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 Manuel A Diaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:03
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; C01B25/222; C01B25/223; C01B25/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
PROCESS FOR PRODUCING CLEAR PHOSPHORIC ACID WHICH COMPRISES DIGESTING CALCIUM PHOSPHATE WITH SULPHURIC ACID IN THE PRESENCE OF A BORON COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE INORGANIC BORON ACIDS, BORON ACID ANHYDRIDES AND THEIR SALTS, THE AMOUNT OF SAID BORON COMPOUND BEING SUCH THAT THE DIGESTION MIXTURE CONTAINS AT LEAST ABOUT 0.00005% BY WEIGHT OF BORON BASED ON THE CALCIUM CONTENT (CALCULATED AS CAO) OF THE MIXTURE, WHEREBY THE CALCIUM SULFATE PRODUCED AS A RESULT OF SAID DIGESTION PREDOMINANTLY IS IN THE FORM OF SMALL RHOMBOIDAL CRYSTALS WITH FEW NEEDLE CRYSTALS INTERMIXED THEREWITH, AND FILTERING THE PRODUCT OF THE DIGESTION REACTION TO RECOVER CLEAR PHOSPHORIC ACID SUBSTANTIALLY FREE OF SUBSEQUENTLY PRECIPITATED CRYSTALS OF CALCIUM SULFATE.
Claim 2
Dependent Claim
117 words
PROCESS FOR PRODUCING CLEAR PHOSPHORIC ACID WHICH COMPRISES DIGESTING CALCIUM PHOSPHATE WITH SULPHURIC ACID IN THE PRESENCE OF A BORON COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE INORGANIC BORON ACIDS, BORON ACID ANHYDRIDES AND THEIR SALTS, THE AMOUNT OF SAID BORON COMPOUND BEING SUCH THAT THE DIGESTION MIXTURE CONTAINS AT LEAST ABOUT 0.00005% BY WEIGHT OF BORON BASED ON THE CALCIUM CONTENT (CALCULATED AS CAO) OF THE MIXTURE, WHEREBY THE CALCIUM SULFATE PRODUCED AS A RESULT OF SAID DIGESTION PREDOMINANTLY IS IN THE FORM OF SMALL RHOMBOIDAL CRYSTALS WITH FEW NEEDLE CRYSTALS INTERMIXED THEREWITH, AND FILTERING THE PRODUCT OF THE DIGESTION REACTION TO RECOVER CLEAR PHOSPHORIC ACID SUBSTANTIALLY FREE OF SUBSEQUENTLY PRECIPITATED CRYSTALS OF CALCIUM SULFATE.
References Cited (Backward Citations)
US2929777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |