Patent US3247221A successfully refreshed from Google Patents.
US3247221A
Expired / Lapsed
US
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Benzodioxane derivatives
Assignee: Pfizer Inc
•
Filing: 1963-05-16
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Granted: 1966-04-19
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Expires: 1983-05-16
Abstract
No abstract record available.
Inventors
- 👤 Augstein Joachim
- 👤 Sheila M Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:49
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/10; C07D319/14; C07D319/16; C07D319/20; C07D405/00; C07D405/02; C07D405/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
2-GUANIDINOAMINOETHYL-1,4-BENZODIOXANE.
Claim 2
Dependent Claim
1 words
2-GUANIDINOAMINOETHYL-1,4-BENZODIOXANE.
Claim 3
Dependent Claim
13 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC BASES OF THE FORMULA:
Claim 4
Dependent Claim
13 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC BASES OF THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |