US3901890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of diketopiperazine dihydroxamates and intermediates therefor
Assignee: Sagami Chemical Research Institute
•
Filing: 1973-08-02
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Granted: 1975-08-26
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Expires: 1993-08-02
Abstract
Abstract A process for the production of diketopiperazine dihydroxamates which are useful in the biological field and intermediates for the synthesis of said diketopiperazine dihydroxamates is disclosed.
Inventors
- 👤 Yoshikazu Isowa
- 👤 Toshiyuki Takashima
- 👤 Muneki Ohmori
- 👤 Hideaki Kurita
- 👤 Masanari Sato
- 👤 Kaoru Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:56
CPC Classifications
C; C07; C07D; C07D295/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
12 words
A PROCESS FOR THE PRODUCTION OF CYCLO-DI-N -ALKANOYLN -HYDROXY-ORNITHYL HAVING THE FORMULA:
Claim 2
Dependent Claim
12 words
A PROCESS FOR THE PRODUCTION OF CYCLO-DI-N -ALKANOYLN -HYDROXY-ORNITHYL HAVING THE FORMULA:
Claim 3
Dependent Claim
12 words
A process for the production of cyclo-di-N -alkanoyl-N -hydroxy-ornithyl having the formula
Claim 4
Dependent Claim
12 words
A process for the production of cyclo-di-N -alkanoyl-N -hydroxy-ornithyl having the formula
Claim 5
Dependent Claim
12 words
A process for the production of cyclo-di-N -alkanoyl-N -hydroxy-ornithyl having the formula
Claim 6
Dependent Claim
12 words
A process for the production of cyclo-di-N -alkanoyl-N -hydroxy-ornithyl having the formula
Claim 7
Dependent Claim
9 words
The process of claim 1 wherein R is methyl.
Claim 8
Dependent Claim
9 words
The process of claim 2 wherein R is methyl.
Claim 9
Dependent Claim
9 words
The process of claim 3 wherein R is methyl.
Claim 10
Dependent Claim
6 words
Cyclo-di-N -tosyl-N -benzyloxy-ornithyl of the formula
Claim 11
Dependent Claim
6 words
Cyclo-di-N -tosyl-N -benzyloxy-ornithyl of the formula
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |