US2539728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver salts of disubstituted methane compounds
Assignee: Ward Blenkinsop and Co Ltd
•
Filing: 1948-02-13
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Granted: 1951-01-30
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Expires: 1968-02-13
Abstract
No abstract record available.
Inventors
- 👤 Craven Alfred Brewerton
- 👤 Pritchard Gordon James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
C; C07; C07C; C07C309/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AS A NEW COMPOUND A SILVER SALT OF A COMPOUND OF THE GENERAL FORMULA R1CH2R2 WHERE R1 AND R2 ARE EACH SELECTED FROM THE GROUP CONSISTING OF PHENOL SULPHONIC ACIDS, ALKYL PHENOL SULPHONIC ACIDS, CARBOXYL PHENOL SULPHONIC ACIDS, DIPHENYL AND DIPHENYL ALKYL MONO- AND DISULPHONIC ACIDS, BENZENE SULPHONIC ACIDS, NAPHTHALENE AND ALKYL NAPHTHALENE MONO- AND DISULPHONIC ACIDS, SULPHO BENZOIC ACID, NAPHTHOL AND ALKYL NAPHTHOL SULPHONIC ACIDS, AND NUCLEAR SUBSTITUTED HALOGEN DERIVATIVES OF THESE ACIDS.
Claim 2
Dependent Claim
74 words
AS A NEW COMPOUND A SILVER SALT OF A COMPOUND OF THE GENERAL FORMULA R1CH2R2 WHERE R1 AND R2 ARE EACH SELECTED FROM THE GROUP CONSISTING OF PHENOL SULPHONIC ACIDS, ALKYL PHENOL SULPHONIC ACIDS, CARBOXYL PHENOL SULPHONIC ACIDS, DIPHENYL AND DIPHENYL ALKYL MONO- AND DISULPHONIC ACIDS, BENZENE SULPHONIC ACIDS, NAPHTHALENE AND ALKYL NAPHTHALENE MONO- AND DISULPHONIC ACIDS, SULPHO BENZOIC ACID, NAPHTHOL AND ALKYL NAPHTHOL SULPHONIC ACIDS, AND NUCLEAR SUBSTITUTED HALOGEN DERIVATIVES OF THESE ACIDS.
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) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |