US2767196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble derivatives of phenolphthalein
Assignee: S B PENICK AND Co
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Filing: 1953-04-20
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Granted: 1956-10-16
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Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Salkin Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:44
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88; C07D307/885
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
23 words
WATER-SOLUBLE DERIVATIVES OF PHENOLPHTHALEIN SELECTED FROM THE GROUP CONSISTING OF THE ALKALI AND ALKALI EARTH METAL SALTS OF THE DISULFATE ESTER OF PHENOLPHTHALEIN.
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) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |