Patent US3250776A successfully refreshed from Google Patents.
US3250776A
Expired / Lapsed
US
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Haloalkyl spiro barbiturates
Assignee: 3M Co
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Filing: 1963-04-05
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Granted: 1966-05-10
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Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 William S Friedlander
- 👤 John R Mattson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:54
CPC Classifications
B; B65; B65H; B65H54/00; B65H54/02; B65H54/28; B65H54/2836; B65H54/2839; B65H59/00; B65H59/40; C; C07; C07D; C07D471/00; C07D471/02; C07D471/10; B65H2553/00; B65H2553/20; B65H2553/26; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF I. A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
14 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF I. A COMPOUND 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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |