US2993930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetra-substituted ureas
Assignee: Midwest Research Institute
•
Filing: 1958-03-18
•
Granted: 1961-07-25
•
Expires: 1978-03-18
Abstract
No abstract record available.
Inventors
- 👤 Cecil C Chappelow
- 👤 Francis V Morriss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:29
CPC Classifications
C; C07; C07C; C07C275/00; C07C275/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
TETRA-SUBSTITUTED UREA OF THE FORMULA:
Claim 2
Dependent Claim
5 words
TETRA-SUBSTITUTED UREA OF THE FORMULA:
References Cited (Backward Citations)
US1437027A
Cited
US1477087A
Cited
US2706534A
Cited
US2668758A
Cited
US2839159A
Cited
US2768971A
Cited
US2817684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |