Patent US2880234A successfully refreshed from Google Patents.
US2880234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid addition products of the tetracyclines
Assignee: Chase Chemical Co LP
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Filing: 1954-12-10
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Granted: 1959-03-31
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Expires: 1974-12-10
Abstract
No abstract record available.
Inventors
- 👤 Emil J Maxion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A PROCESS COMPRISING ADMIXING UNDER AQUEOUS ACIDIC CONDITIONS A MOLAR EQUIVALENT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF TETRACYCLINE, CHLORTETRACYCLINE AND OXYTETRACYCLINE WITH A MOLAR EQUIVALENT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORTHOHYDROXYBENZOIC ACID, ORTHO-HYDROXYNAPHTHOIC ACID, METHYLENE-BIS-ORTHO-HYDROXYBENZOIC ACID, METHYLENE-BISORTHO-HYDROXYNPHTHOIC ACID, AND THEIR NUCLEARLY SUBSTITUTED LOWER ALKYL, PHENYL, LOWER ALKYL PHENYL, HALOGEN, AMINO, AND NITRO DERIVATIVES, AND THE SODIUM SALTS THEREOF, AND RECOVERIONG THE RESULTING PRECIPATED ADDITION PRODUCT OF SAID SUBSTANCE WITH SAID COMPOUND.
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) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |