US2855435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted hydrazines by reaction of dichlorourea with amines
Assignee: WR Grace and Co
•
Filing: 1958-03-27
•
Granted: 1958-10-07
•
Expires: 1978-03-27
Abstract
No abstract record available.
Inventors
- 👤 Gerald F Grillot
- 👤 Richard C Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:12
CPC Classifications
C; C05; C05C; C05C9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
THE PROCESS OF PREPARING A PRODUCT OF THE CLASS OF COMPOUNDS HAVING THE FORMULA
Claim 2
Dependent Claim
14 words
THE PROCESS OF PREPARING A PRODUCT OF THE CLASS OF COMPOUNDS HAVING 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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |