Patent EP0341988B1 successfully refreshed from Google Patents.
Patent US3256152A successfully refreshed from Google Patents.
US3256152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration and purification of interferons, viral inhibiting substances (vis), viral inhibiting factors (vif), or viral inhibitory material
Assignee: Merck and Co Inc
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Filing: 1965-06-14
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Granted: 1966-06-14
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Expires: 1985-06-14
Abstract
No abstract record available.
Inventors
- 👤 George P Lampson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:14
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/435; C07K14/52; C07K14/555; Y; Y10; Y10S; Y10S435/00; Y10S435/811
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FR CONCENTRATING INTERFERONS FROM A FLUID MEDIUM INTO WHICH INTERFERON HAS BEEN ELABORATED BY CELLS IN CONTACT WITH INTERFERON INDUCING AGENTS COMPRISING ADDING TO SAID FLUID MEDIUM MAINTAINED AT A TEMPERATURE BETWEEN 0 TO 30*C. A PROTEIN PRECIPITATING AGENT SELECTED FROM THE GROUP CONSISTING OF PERCHLORIC ACID, TRICHLORACETIC ACID, SULFOSALICYLIC ACID AND TETRAMETAPHOSPHATE TO A FINAL CONCENTRATION OF 1-3% OF SAID INTERFERON-CONTAINING FLUID, ADJUSTING THE SUPERNATE TO PH 6-8 AND THEN ADDING A HEAVY METAL SALT SELECTED FROM THE GROUP CONSISTING OF COBALT, ZINC, CALCIUM, MERCUTY, STRONTIUM AND BARIUM SALTS OF ACETIC ACID, GLYCINE, LACTIC ACID, PROPIONIC ACID AND HYDROCHLORIC ACID TO COPRECIPITATE THE INTERFERON.
Claim 2
Dependent Claim
107 words
A PROCESS FR CONCENTRATING INTERFERONS FROM A FLUID MEDIUM INTO WHICH INTERFERON HAS BEEN ELABORATED BY CELLS IN CONTACT WITH INTERFERON INDUCING AGENTS COMPRISING ADDING TO SAID FLUID MEDIUM MAINTAINED AT A TEMPERATURE BETWEEN 0 TO 30*C. A PROTEIN PRECIPITATING AGENT SELECTED FROM THE GROUP CONSISTING OF PERCHLORIC ACID, TRICHLORACETIC ACID, SULFOSALICYLIC ACID AND TETRAMETAPHOSPHATE TO A FINAL CONCENTRATION OF 1-3% OF SAID INTERFERON-CONTAINING FLUID, ADJUSTING THE SUPERNATE TO PH 6-8 AND THEN ADDING A HEAVY METAL SALT SELECTED FROM THE GROUP CONSISTING OF COBALT, ZINC, CALCIUM, MERCUTY, STRONTIUM AND BARIUM SALTS OF ACETIC ACID, GLYCINE, LACTIC ACID, PROPIONIC ACID AND HYDROCHLORIC ACID TO COPRECIPITATE THE INTERFERON.
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |