Patent US2827466A successfully refreshed from Google Patents.
US2827466A
Expired / Lapsed
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Bis-quaternary ammonium salts of amsonic acid
Assignee: May and Baker Ltd
•
Filing: 1954-02-04
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Granted: 1958-03-18
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Expires: 1974-02-04
Abstract
No abstract record available.
Inventors
- 👤 Slack Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:04
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA:
Claim 3
Dependent Claim
10 words
PENTAMETHYLENE - 1:5-BIS(1''-METHYLPYRROLIDINIUM)4:4''-DIAMINO-STILBENE - 2:2'' - DISULPHONATE HAVING THE FORMULA:
Claim 4
Dependent Claim
10 words
PENTAMETHYLENE - 1:5-BIS(1''-METHYLPYRROLIDINIUM)4:4''-DIAMINO-STILBENE - 2:2'' - DISULPHONATE HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |