US4186193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hepatitis B antigen
Assignee: Merck and Co Inc
•
Filing: 1977-10-25
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Granted: 1980-01-29
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Expires: 1997-10-25
Abstract
Abstract Hepatitis B surface antigen free of gradient-derived added cesium and potassium ions, for example the antigen in an aqueous solution of sodium bromide.
Inventors
- 👤 William J. McAleer
- 👤 Edward H. Wasmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:51
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/005; C12; C12N; C12N2730/00; C12N2730/00011; C12N2730/10011; C12N2730/10111; C12N2730/10122
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
A composition comprising HB s Ag in an aqueous solution of sodium bromide.
Claim 2
Dependent Claim
13 words
A composition comprising HB s Ag in an aqueous solution of sodium bromide.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 wherein the aqueous solution of sodium bromide is a density gradient solution.
Claim 4
Dependent Claim
15 words
A composition according to claim 2 wherein the density gradient solution is a step gradient.
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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |