US2638478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus-containing derivatives of m-amino-phenols
Assignee: F Hoffmann La Roche AG
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Filing: 1950-05-03
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Granted: 1953-05-12
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Expires: 1970-05-03
Abstract
No abstract record available.
Inventors
- 👤 Morrison Alexander Lang
- 👤 Atherton Frank Ratcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:28
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF M-DIMETHYLAMINOPHENYL-DI-LOWER ALKYL PHOSPHATES AND THE QUATERNARY AMMONIUM SALTS THEREOF.
Claim 2
Dependent Claim
17 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF M-DIMETHYLAMINOPHENYL-DI-LOWER ALKYL PHOSPHATES AND THE QUATERNARY AMMONIUM SALTS THEREOF.
References Cited (Backward Citations)
US257649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |