US2820035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barbituric acid derivatives
Assignee: C.H. Boehringer Sohn AG and Co KG
•
Filing: 1954-10-05
•
Granted: 1958-01-14
•
Expires: 1974-10-05
Abstract
No abstract record available.
Inventors
- 👤 Scheffler Heinz
- 👤 Kottler August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:03
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/60; C07D239/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
AS A PRODUCT OF MANUFACTURE, A BARBITURIC COMPOUND HAVIGN THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
12 words
AS A PRODUCT OF MANUFACTURE, A BARBITURIC COMPOUND HAVIGN THE STRUCTURAL FORMULA
References Cited (Backward Citations)
US2006610A
Cited
US2019936A
Cited
US2035317A
Cited
US2222455A
Cited
US2156346A
Cited
US2266718A
Cited
US2260800A
Cited
US2313501A
Cited
US2373011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |