US2873281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of bis-quaternary
Assignee: —
•
Filing: —
•
Granted: 1959-02-10
•
Expires: 1976-02-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:38
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/58; C07D209/60; C07D209/02; C07D209/44; C07D209/46; C07D209/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
PROCESS FOR THE PREPARATION OF 2-(N,(-DI-LOWER ALKYL-AMINO-LOWER ALKYL)-BENZ-POLYCHLORO-ISOINDOLINE DIMETHOCHLORIDES WHICH COMPRISES TREATING IN A CLOSED VESSEL A SOLUTION OF A MEMBER OF THE GROUP CONSISTING OF A 2-(N,N - DI - LOWER ALKYL - AMINO - LOWER ALKYL) - BENZPOLYCHLORO-ISOINDOLINE AND THE CORRESPONDING MONOMETHOCHLORIDE IN FORMAMIDE WITH AN EXCESS OF METHYLCHLORIDE AT AN ELEVATED TEMPERATURE
Claim 2
Dependent Claim
55 words
PROCESS FOR THE PREPARATION OF 2-(N,(-DI-LOWER ALKYL-AMINO-LOWER ALKYL)-BENZ-POLYCHLORO-ISOINDOLINE DIMETHOCHLORIDES WHICH COMPRISES TREATING IN A CLOSED VESSEL A SOLUTION OF A MEMBER OF THE GROUP CONSISTING OF A 2-(N,N - DI - LOWER ALKYL - AMINO - LOWER ALKYL) - BENZPOLYCHLORO-ISOINDOLINE AND THE CORRESPONDING MONOMETHOCHLORIDE IN FORMAMIDE WITH AN EXCESS OF METHYLCHLORIDE AT AN ELEVATED TEMPERATURE
References Cited (Backward Citations)
US2740795A
Cited
US2582748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |