Patent US3923489A successfully refreshed from Google Patents.
US3923489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pelletized fertilizer
Assignee: Individual
•
Filing: 1973-05-23
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Granted: 1975-12-02
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Expires: 1993-05-23
Abstract
Abstract A method of producing and pelletizing fertilizer by compounding dry ammonium sulphate and fly ash and subsequently treating the dry compound of ammonium sulphate and fly ash with a saturated solution of ammonium sulphate and water to form a wet doughy mass which is formed into pellets and dried.
Inventors
- 👤 Ralph W Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:53
CPC Classifications
C; C05; C05C; C05C3/00; C05C3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A METHOD FOR MAKING A PELLETIZED NITROGEN FERTILIZER WHERE THE NITROGEN CONTENT OF THE FINAL FERTILIZER PRODUCT IS REGULATING COMPRISING: A. THROUGHLY MIXING DRY AMMONIUM SULPHATE WITH FLY ASH IN THE PROPORTIONS OF AT LEAST ONE PART AMMONIUM SULPHATE TO THREE PARTS FLY ASH BY WEIGHT WHEREBY THE NITROGEN CONTENT IS REGULATED BY THE AMOUNT OF FLY ASH ADDED TO THE AMMONIUM SULPHATE WHILE BOTH ARE BEING DRY MIXED, B. MAKING A SATURATED SOLUTION OF AMMONIUM SULPHATE AND WATER, C. BLENDING THE MIXTURE OF DRY AMMONIUM SULPHATE AND FLY ASH WITH THE SATURATED SOLUTION OF AMMONIUM SULPHATE AND WATER TO FORM A WET DOUGHY MASS, D. FORMING THE SAID WET DOUGHY MASS INTO SMALL INDIVIDUAL PARTICLES BY PELLETIZING THE SAME, AND E. DRYING BY INDIVIDUAL PARTICLES TO FORM A GRANULATED FERTILIZER.
Claim 2
Independent Claim
131 words
A METHOD FOR MAKING A PELLETIZED NITROGEN FERTILIZER WHERE THE NITROGEN CONTENT OF THE FINAL FERTILIZER PRODUCT IS REGULATING COMPRISING: A. THROUGHLY MIXING DRY AMMONIUM SULPHATE WITH FLY ASH IN THE PROPORTIONS OF AT LEAST ONE PART AMMONIUM SULPHATE TO THREE PARTS FLY ASH BY WEIGHT WHEREBY THE NITROGEN CONTENT IS REGULATED BY THE AMOUNT OF FLY ASH ADDED TO THE AMMONIUM SULPHATE WHILE BOTH ARE BEING DRY MIXED, B. MAKING A SATURATED SOLUTION OF AMMONIUM SULPHATE AND WATER, C. BLENDING THE MIXTURE OF DRY AMMONIUM SULPHATE AND FLY ASH WITH THE SATURATED SOLUTION OF AMMONIUM SULPHATE AND WATER TO FORM A WET DOUGHY MASS, D. FORMING THE SAID WET DOUGHY MASS INTO SMALL INDIVIDUAL PARTICLES BY PELLETIZING THE SAME, AND E. DRYING BY INDIVIDUAL PARTICLES TO FORM A GRANULATED FERTILIZER.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |