Patent US3221016A successfully refreshed from Google Patents.
US3221016A
Expired / Lapsed
US
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Piperazine derivatives and method of preparation
Assignee: Texaco Inc
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Filing: 1962-07-16
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Granted: 1965-11-30
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Expires: 1982-07-16
Abstract
No abstract record available.
Inventors
- 👤 Vernon A Currier
- 👤 Cuscurida Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:18
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/3293
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
1-(I(BIS(I-HYDROXYPROPYL)AMINO)ETHYL)-4-(2-HYDROXPROPYL)PIPERAZINE.
Claim 2
Dependent Claim
1 words
1-(I(BIS(I-HYDROXYPROPYL)AMINO)ETHYL)-4-(2-HYDROXPROPYL)PIPERAZINE.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |