Patent BE753472A successfully refreshed from Google Patents.
US2977375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing n-sulphanilyl ureas
Assignee: Roche Diagnostics GmbH
•
Filing: 1954-02-03
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Granted: 1961-03-28
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Expires: 1974-02-03
Abstract
No abstract record available.
Inventors
- 👤 Haack Erich
- 👤 Hagedorn Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:21
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/50; C07C311/52; C07C311/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
IN THE PROCESS OF PRODUCING SULFANILYL UREA COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
11 words
IN THE PROCESS OF PRODUCING SULFANILYL UREA COMPOUNDS OF THE FORMULA
References Cited (Backward Citations)
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CH233367A
Cited
US2312404A
Cited
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Cited
CH227924A
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Cited
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Cited
CH233109A
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CH267635A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |