Patent US698798A successfully refreshed from Google Patents.
US3574591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for preparing mixed cation polyphosphates
Assignee: Monsanto Co
•
Filing: 1968-05-15
•
Granted: 1971-04-13
•
Expires: 1988-05-15
Abstract
Abstract A PROCESS FOR PRODUCING SLOWLY SOLUBLE AMMONIUM-POTASSIUM-MULTIVALENT METAL CATION POLYPHOSPHATES, USEFUL AS SLOW RELEASE FERTILIZERS IS DISCLOSED WHICH PROCESS COMPRISES THERMALLY CONDENSING (1) AN INORGANIC PHOSPHATECONTAINING MATERIAL (2) A POTASSIUM-CONTAINING MATERIAL AND (3) A MULTIVALENT METAL SOURCE, IN THE PRESENCE OF A COMBINED AMMONIATING AND CONDENSING AGENT, UNDER CONTROLLED TEMPERATURE CONDITIONS TO THEREBY PRODUCE THE MIXED CATION POLYPHOSPHATES CONTAINING SPECIFIED RATIOS OF THE NITROGEN AND POTASSIUM AND SPECIFIED QUANTITIES OF MULTIVALENT CATIONS.
Inventors
- 👤 John W Lyons
- 👤 George A Rauh Jr
- 👤 Howard L Vandersall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:13
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45; C01B25/451; C05; C05B; C05B13/00; C05B13/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |