US3617239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing micronutrient coated urea prills and products
Assignee: Olin Corp
•
Filing: 1969-03-03
•
Granted: 1971-11-02
•
Expires: 1989-03-03
Abstract
Abstract Urea prills are reacted with finely divided minor amounts of water-soluble inorganic hydrated salts of micronutrient fertilizer elements and dried to produce a chemically integral coating of urea-micronutrient salt complex which provides micronutrients and anticaking properties to the urea prills.
Inventors
- 👤 Andrev J Klanica
- 👤 Henry W Schiessl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:25
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
Method as claimed in claim 1 in which the micronutrient element of said hydrated salt is selected from the group consisting or iron, manganese, molybdenum, copper, zinc and chlorine.
Claim 2
Dependent Claim
25 words
Method as claimed in claim 1 in which said drying is conducted at a temperature below 130* C. under a pressure below 100 mm. Hg.
Claim 3
Dependent Claim
26 words
Method as claimed in claim 3 in which said drying is conducted at from 20* to 100* C. under a pressure under about 100 mm. Hg.
Claim 4
Dependent Claim
10 words
Coated urea prills prepared by the method of claim 1.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |