US4609740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivatives of fluorescein
Assignee: Yeda Research and Development Co Ltd
•
Filing: 1982-05-20
•
Granted: 1986-09-02
•
Expires: 2002-05-20
Abstract
Abstract The invention relates to derivatives of fluorescein and to their production. The compounds are of value in determining the intracellular pH. Thus there may be obtained fluorescent living cells with a comparatively stable level of fluorescence. The novel fluorescein compounds can be used for other labelling purposes in biology and biochemistry.
Inventors
- 👤 Avner Rotman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:48
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
2 words
Azidofluorescein diacetate.
Claim 2
Dependent Claim
2 words
Azidofluorescein diacetate.
Claim 3
Dependent Claim
1 words
Azidofluorescein.
Claim 4
Dependent Claim
1 words
Azidofluorescein.
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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |