Patent US2518525A successfully refreshed from Google Patents.
US2518525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Levulinic acid salts of amino benzoates
Assignee: Individual
•
Filing: 1946-08-12
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Granted: 1950-08-15
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Expires: 1966-08-12
Abstract
No abstract record available.
Inventors
- 👤 Curtis David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:59
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AS A NEW COMPOSITION OF MATTER, A SALT OF AN ALKYL ESTER OF AN AMINO-BENOZIC ACID, IN WHICH THE ALKYL RADICLE IS A MEMBER OF THE GROUP CONSISTING OF METHYL, ETHYL, PROPYL AND BUTYL RADICLES, AND LEVULINIC ACID.
Claim 2
Dependent Claim
38 words
AS A NEW COMPOSITION OF MATTER, A SALT OF AN ALKYL ESTER OF AN AMINO-BENOZIC ACID, IN WHICH THE ALKYL RADICLE IS A MEMBER OF THE GROUP CONSISTING OF METHYL, ETHYL, PROPYL AND BUTYL RADICLES, AND LEVULINIC ACID.
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) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |