US2783245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of phthaloylation amino acids
Assignee: Wyeth Holdings LLC
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Filing: 1953-07-27
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Granted: 1957-02-26
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Expires: 1973-07-27
Abstract
No abstract record available.
Inventors
- 👤 Weidenheimer Joseph Francis
- 👤 Ritter Lawrence
- 👤 Richter Ferdinand Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:28
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A METHOD OF PREPARING ALPHA PHTHALIMIDO ACETIC ACIDS WHICH COMPRISES THE STEP OF HEATING TOGETHER PHTHALIC ANHYDRIDE AND AN ALPHA AMINO ACID IN A SOLVENT HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
29 words
A METHOD OF PREPARING ALPHA PHTHALIMIDO ACETIC ACIDS WHICH COMPRISES THE STEP OF HEATING TOGETHER PHTHALIC ANHYDRIDE AND AN ALPHA AMINO ACID IN A SOLVENT HAVING THE GENERAL FORMULA:
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) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |