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Patent US4119579A successfully refreshed from Google Patents.
US4119579A
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US
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Polymeric orthoesters
Assignee: Alza Corp
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Filing: 1977-09-28
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Granted: 1978-10-10
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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 Carl Capozza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:35
CPC Classifications
C; C08; C08G; C08G4/00; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
56 words
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, a cycloalkylene, and a cycloalkenylene, and wherein a is 2 to 3, and n is greater than 10.
Claim 2
Dependent Claim
56 words
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, a cycloalkylene, and a cycloalkenylene, and wherein a is 2 to 3, and n is greater than 10.
Claim 3
Dependent Claim
26 words
The polymer according to claim 1, wherein R 1 is a cycloalkyl substituted with a member selected from the group consisting of alkyl, alkenyl, and alkoxy.
Claim 4
Dependent Claim
26 words
The polymer according to claim 1, wherein R 1 is a cycloalkenyl substituted with a member selected from the group consisting of alkyl, alkenyl, and alkoxy.
Claim 5
Dependent Claim
26 words
The polymer according to claim 1 wherein R 1 is an aryl substituted with a member selected from the group consisting of alkyl, alkenyl, and alkoxy.
Claim 6
Dependent Claim
27 words
The polymer according to claim 1, wherein R 2 is a cycloalkylene substituted with a member selected from the group consisting of alkyl, alkenyl, alkoxy, and alkylene.
Claim 7
Dependent Claim
27 words
The polymer according to claim 1, wherein R 2 is a cycloalkenylene substituted with a member selected from the group consisting of alkyl, alkenyl, alkoxy, and alkylene.
Claim 8
Dependent Claim
15 words
The polymer according to the formula of claim 1, wherein n is 10 to 100,000.
Claim 9
Dependent Claim
106 words
The polymer according to the formula of 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, 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, an alkenylene of 2 to 20 carbon atoms, a cycloalkylene of 3 to 8 carbon atoms, and a cycloalkenylene of 4 to 8 carbon atoms, and wherein a is 2 to 3, and n is greater than 10.
Claim 10
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR41##
Claim 11
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR42##
Claim 12
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR43##
Claim 13
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR44##
Claim 14
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR45##
Claim 15
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR46##
Claim 16
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR47##
Claim 17
Dependent Claim
17 words
The polymer according to claim 1 of the following formula wherein n is greater than 10: ##STR48##
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |