US3357790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcining method for conversion of alkaline earth orthophosphates to the pyrophosphate form
Assignee: Monsanto Co
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Filing: 1963-03-18
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Granted: 1967-12-12
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Expires: 1983-03-18
Abstract
No abstract record available.
Inventors
- 👤 Saunders Elerington
- 👤 Wright Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:18
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24; A61Q; A61Q11/00; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/42; C07; C07H; C07H15/00; C07H15/02; C07H15/04; C07H15/08; C08; C08B; C08B31/00; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4829; C08G18/487; C08G18/4883; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; C08G65/2642; C08G65/2669; C08G65/2672
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
125 words
IN A PROCESS FOR MANUFACTURING AN ALKALINE-EARTH METAL PYROPHOSPHATE SUITABLE FOR USE AS A DENTIFRICE ABRASIVE WHEREIN A MNOBASIC DIALKALINE-EARTH METAL ORTHOPHOSPHATE IS MOLECULARLY DEHYDRATED BY CALCINING AT A TEMPERATURE BELOW THE MELTING POINT OF SAID PYROPHOSPHATE TO FORM SAID PYROPHOSPHATE, TE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID MONOBASIC DIALKALINEEARTH METAL ORTHOPHOSPHATE, PRIOR TO CALCINING, A NEUTRAL TO BASIC ALKALI METAL COMPOUND IN AN AMOUNT SUFFICIENT TO PROVIDE FORM 650 P.P.M. TO 20,000 P.P.M. OF ALKALI METAL CONTENT BVASED ON SAID MONOBASIC ORTHOPHOSPHATE; SAID NEUTRAL TO BSIC COMPOUND EING FURTHER CHARACTERIZED IN THAT WHEN DISSOLVED IN DISTILLED WATER AT 26*C. AT A CONCENTRATION OF 1% BY WEIGHT, IT WILL RELEASE ALKALI METAL CATIONS WITHIN THE AFORESAID CONCENTRATION RANGE AND ALSO PROVIDES A PH ABOUVE 6.5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |