Patent US2544660A successfully refreshed from Google Patents.
US2544660A
Expired / Lapsed
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Benzeydrylurea addition compound and method for preparing same
Assignee: F Hoffmann La Roche AG
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Filing: 1949-11-17
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Granted: 1951-03-13
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Duschinsky Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
C; C07; C07C; C07C275/00; C07C275/04; C07C275/20; C07C275/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
THE ADDITION COMPOUND A-AMINO-A,A-DIPHENYLACETAMIDE BENZHYDRYLUREA.
Claim 2
Dependent Claim
5 words
THE ADDITION COMPOUND A-AMINO-A,A-DIPHENYLACETAMIDE BENZHYDRYLUREA.
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) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |