US2498665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of peptides
Assignee: Individual
•
Filing: 1947-08-12
•
Granted: 1950-02-28
•
Expires: 1967-08-12
Abstract
No abstract record available.
Inventors
- 👤 Oliver H Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:23
CPC Classifications
C; C07; C07K; C07K5/00; C07K5/04; C07K5/08; C07K5/0802; C07K5/0804; C07K5/0806; C07K1/00; C07K1/06; C07K1/061; C07K1/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS COMPRISING REACTING A PHTHALYL AMINO ACID HALIDE WITH A MEMBER SELECTED FROM THE CLASS CONSISTING OF AMINO ACIDS AND PEPTIDES IN THE PRESENCE OF A NEUTRAL TO WEAKLY ALKALINE BUFFER TO PRODUCE A PHTHALYL PEPTIDE, AND THEN REFLUXING THE PHTHALYL PEPTIDE SO FORMED WITH WATER AND A MEMBER SELECTED FROM THE CLASS CONSISTING OF HYDRAZINE, HYDRAZINE HYDRATE, AND THE MINERAL ACID SALTS OF HYDRAZINE TO PRODUCE A PEPTIDE.
Claim 2
Dependent Claim
70 words
A PROCESS COMPRISING REACTING A PHTHALYL AMINO ACID HALIDE WITH A MEMBER SELECTED FROM THE CLASS CONSISTING OF AMINO ACIDS AND PEPTIDES IN THE PRESENCE OF A NEUTRAL TO WEAKLY ALKALINE BUFFER TO PRODUCE A PHTHALYL PEPTIDE, AND THEN REFLUXING THE PHTHALYL PEPTIDE SO FORMED WITH WATER AND A MEMBER SELECTED FROM THE CLASS CONSISTING OF HYDRAZINE, HYDRAZINE HYDRATE, AND THE MINERAL ACID SALTS OF HYDRAZINE TO PRODUCE A PEPTIDE.
References Cited (Backward Citations)
US2184279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |