Patent US4100158A successfully refreshed from Google Patents.
US4100158A
Expired / Lapsed
US
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Osmium compounds
Assignee: Johnson Matthey PLC
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Filing: 1976-07-02
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Granted: 1978-07-11
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Expires: 1996-07-02
Abstract
Abstract This specification describes a complex of osmium tetroxide and a compound having a heterocyclic ring containing one or two tertiary nitrogen atoms. The compound may be an aromatic tertiary amine and the tertiary nitrogen atom may be the sole heterocyclic atom in the heterocyclic ring. The complexes described are suitable for fixing and staining cells and may be used in the preparation of biological specimens for examination by electron microscopy.
Inventors
- 👤 Paul Cedric Hydes
- 👤 Michael James Cleare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:55
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/08; C07D217/00; C07D217/02; C07D237/00; C07D237/02; C07D237/06; C07D237/08; C07D237/26; C07D237/30; C07D453/00; C07D453/02; C07F; C07F15/00; C07F15/0006; C07F15/002; C07F15/0026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A complex consisting of osmium tetroxide and a compound selected from the group consisting of pyridazine, phthalazine, isoquinoline, triethylenediamine, and quinuclidine.
Claim 2
Dependent Claim
21 words
A complex consisting of osmium tetroxide and a compound selected from the group consisting of pyridazine, phthalazine, isoquinoline, triethylenediamine, and quinuclidine.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |