Patent US4155740A successfully refreshed from Google Patents.
US4155740A
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Fertilizer coated with orthoester polymer
Assignee: Alza Corp
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Filing: 1977-09-28
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Granted: 1979-05-22
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Expires: 1997-09-28
Abstract
Abstract This invention concerns polymeric orthoesters having a repeating mer comprising a hydrocarbon radical and an orthoester functionality of the general formula: ##STR1## wherein R 1 is a monovalent radical, R 2 is a hydrocarbon radical, a is 2 to 3, and n is at least 10. The polymers are useful for making articles of manufacture and as coatings for beneficial agents.
Inventors
- 👤 Richard C. Capozza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
C; C08; C08G; C08G4/00; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
A composition of matter comprising a fertilizer coated with a polymer of the general formula: ##STR40## wherein R 1 is a member selected from the group consisting of hydrogen, alkyl, alkenyl, cycloalkyl, cycloalkenyl, and aryl, R 2 is a member selected from the group consisting of alkylene, an alkenylene, a cycloalkylene, and a cycloalkenylene, and wherein a is 2 to 3, and n is greater than 10.
Claim 2
Dependent Claim
67 words
A composition of matter comprising a fertilizer coated with a polymer of the general formula: ##STR40## wherein R 1 is a member selected from the group consisting of hydrogen, alkyl, alkenyl, cycloalkyl, cycloalkenyl, and aryl, R 2 is a member selected from the group consisting of alkylene, an alkenylene, a cycloalkylene, and a cycloalkenylene, and wherein a is 2 to 3, and n is greater than 10.
Claim 3
Dependent Claim
13 words
The composition of matter according to claim 1, wherein the fertilizer is, urea.
Claim 4
Dependent Claim
101 words
The composition of matter according to claim 1, wherein R 1 is a member selected from the group consisting of alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, and cycloalkenyl of 4 to 8 carbon atoms, and R 2 is a member selected from the group consisting of alkylene of 1 to 20 carbon atoms, alkenylene of 2 to 20 carbon atoms, cycloalkylene of 3 to 8 carbon atoms, and cycloalkenylene of 4 to 8 carbon atoms, a is 2 to 3, and n is greater than 10.
Claim 5
Dependent Claim
21 words
The composition of matter according to claim 1, wherein the fertilizer is coated with 0.1% to 10% by weight of polymer.
References Cited (Backward Citations)
US3708276A
Cited
US4015970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |