US2843590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of piperazines
Assignee: Dow Chemical Co
•
Filing: 1956-03-23
•
Granted: 1958-07-15
•
Expires: 1976-03-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Scigliano
- 👤 Edgar C Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:26
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
METHOD FOR PREPARING A PIPERAZINE PRODUCT HAVING BROMIDES ARE EMPLOYED IN PLACE OF HYDROCHLORIDES. LIKETHE GENERAL FORMULA:
Claim 2
Dependent Claim
17 words
METHOD FOR PREPARING A PIPERAZINE PRODUCT HAVING BROMIDES ARE EMPLOYED IN PLACE OF HYDROCHLORIDES. LIKETHE GENERAL FORMULA:
References Cited (Backward Citations)
GB595430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |