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Patent US3271450A successfully refreshed from Google Patents.
US3271450A
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US
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2, 2'-(ethylenediimino)-di-1-butanols
Assignee: Wyeth Holdings LLC
•
Filing: 1965-02-12
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Granted: 1966-09-06
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Expires: 1985-02-12
Abstract
No abstract record available.
Inventors
- 👤 Wilkinson Raymond George
- 👤 Shepherd Robert Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:02
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A MEMBER OF THE CLASS CONSISTING OF SYMMETRICAL ETHYLENEDIAMINES OF THE FORMULA:
Claim 2
Dependent Claim
12 words
A MEMBER OF THE CLASS CONSISTING OF SYMMETRICAL ETHYLENEDIAMINES OF THE FORMULA:
References Cited (Backward Citations)
US2739981A
Cited
GB799057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |