US3298923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing purine derivatives
Assignee: Takeda Pharmaceutical Co Ltd
•
Filing: 1963-08-07
•
Granted: 1967-01-17
•
Expires: 1983-08-07
Abstract
No abstract record available.
Inventors
- 👤 Banno Isao
- 👤 Iijima Teiji
- 👤 Hasegawa Takezi
- 👤 Igarasi Seizi
- 👤 Imada Akira
- 👤 Nogami Ikuo
- 👤 Suhara Ikuo
- 👤 Yoneda Masahiko
- 👤 Ohmura Einosuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:26
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/26; C12P19/28; C12P19/30; C12P19/32; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/16; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/832; Y10S435/837; Y10S435/848; Y10S435/849; Y10S435/911; Y10S435/921; Y10S435/94; Y10S435/942; Y10S435/944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A METHOD FOR PRODUCING A PURINE DERIVATIVE OF THE FORMULA:
Claim 2
Independent Claim
10 words
A METHOD FOR PRODUCING A PURINE DERIVATIVE OF THE 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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |