US2647928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized compositions of hydroxyphenylammonium halides
Assignee: F Hoffmann La Roche AG
•
Filing: 1951-06-28
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Granted: 1953-08-04
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Expires: 1971-06-28
Abstract
No abstract record available.
Inventors
- 👤 Stempel Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:18
CPC Classifications
A; A61; A61K; A61K47/00; A61K47/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
AN AQUEOUS SOLUTION OF (3-HYDROXYPHENYL)ETHYL DIMETHYLAMMONIUM HALIDE STABILIZED AGAINST COLOR FORMATION BY MEANS OF AN ALKALI METAL SULFITE.
Claim 2
Dependent Claim
18 words
AN AQUEOUS SOLUTION OF (3-HYDROXYPHENYL)ETHYL DIMETHYLAMMONIUM HALIDE STABILIZED AGAINST COLOR FORMATION BY MEANS OF AN ALKALI METAL SULFITE.
References Cited (Backward Citations)
US2130322A
Cited
US2208485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |