US4011219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalazine derivatives and salts thereof
Assignee: Chugai Pharmaceutical Co Ltd
•
Filing: 1975-03-28
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Granted: 1977-03-08
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Expires: 1995-03-28
Abstract
Abstract Phthalazine derivatives represented by the formula ##STR1## and salts thereof which are useful for a luminescence immuno assay, or a process for preparing the same are disclosed.
Inventors
- 👤 Yasuho Nishii
- 👤 Shun-ichi Hata
- 👤 Kiyoshige Wakabayashi
- 👤 Koji Mizuno
- 👤 Akio Yoshida
- 👤 Minoru Shindo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
C; C07; C07D; C07D237/00; C07D237/26; C07D237/30; C07D237/32; Y; Y10; Y10S; Y10S436/00; Y10S436/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
A compound represented by the formula ##STR3## wherein R represents an alkylene having 1-6 carbon atoms, or a salt thereof.
Claim 2
Dependent Claim
20 words
A compound represented by the formula ##STR3## wherein R represents an alkylene having 1-6 carbon atoms, or a salt thereof.
Claim 3
Dependent Claim
13 words
The compound as set forth in claim 1 wherein said alkylene is ethylene.
Claim 4
Dependent Claim
13 words
A compound as set forth in claim 1 wherein said alkylene is trimethylene.
References Cited (Backward Citations)
GB1100911A
Cited
US3497512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |