US2688020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dihydrouracils
Assignee: Wyeth Holdings LLC
•
Filing: 1952-01-17
•
Granted: 1954-08-31
•
Expires: 1972-01-17
Abstract
No abstract record available.
Inventors
- 👤 Johnstone S Mackay
- 👤 Frank Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:52
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/20; C07D239/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE METHOD OF TREATING UREA WITH AN ACRYLAMIDE SULFATE OF THE FORMULA
Claim 2
Independent Claim
12 words
THE METHOD OF TREATING UREA WITH AN ACRYLAMIDE SULFATE 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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |