Patent US2719174A successfully refreshed from Google Patents.
US2719174A
Expired / Lapsed
US
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Method of preparation of tetraalkylguanylureas
Assignee: Wyeth Holdings LLC
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Filing: 1953-08-11
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Granted: 1955-09-27
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Expires: 1973-08-11
Abstract
No abstract record available.
Inventors
- 👤 Hechenbleikner Ingenuin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:52
CPC Classifications
C; C07; C07C; C07C277/00; C07C277/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A METHOD OF PREPARING A TETRAALKYLGUANYLUREA OF THE FORMULA
Claim 2
Independent Claim
9 words
A METHOD OF PREPARING A TETRAALKYLGUANYLUREA OF THE FORMULA
References Cited (Backward Citations)
US2265944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |