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US4469790A
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Continuous and spontaneous interferon producing lymphoblastoid cell lines, process for preparing the same, and process for the human interferon production by the same
Assignee: Ajinomoto Co Inc
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Filing: 1981-09-18
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Granted: 1984-09-04
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Expires: 2001-09-18
Abstract
Abstract Process for preparing a continuous and spontaneous human-interferon-producing lymphoblastoid cell line which involves (a) transforming human lymphocytes isolated from a human infant from birth up to about 2 years or an aborted human fetus, the transforming being carried out with Epstein Barr Virus and (b) selecting from the resulting transformed cell lines a cell line producing more than 1000 units of interferon per milliliter when cultivated at a cell density of 10 6 cells per milliliter in the absence of any interferon inducer.
Inventors
- 👤 Isao Yamane
- 👤 Takeshi Sato
- 👤 Toshio Kudo
- 👤 Yoshiki Minamoto
- 👤 Takehiko Tachibana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:58
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/435; C07K14/52; C07K14/555; Y; Y10; Y10S; Y10S435/00; Y10S435/811; Y10S435/8215; Y10S435/948
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A process for preparing a continuous and spontaneous human-interferon-producing lymphoblastoid cell line, which comprises: transforming human lymphocytes isolated from a human infant from birth up to about 2 years, a new-born infant, or an aborted human fetus, wherein said transforming is performed with Epstein Barr Virus and wherein multiple human lymphocytes are transformed to give multiple transformed cell lines, and selecting a cell line from said transformed cell lines which produces more than 1000 units of interferon per milliliter when cultivated at a cell density of 10 6 cells per milliliter in the absence of any interferon inducer.
Claim 2
Dependent Claim
98 words
A process for preparing a continuous and spontaneous human-interferon-producing lymphoblastoid cell line, which comprises: transforming human lymphocytes isolated from a human infant from birth up to about 2 years, a new-born infant, or an aborted human fetus, wherein said transforming is performed with Epstein Barr Virus and wherein multiple human lymphocytes are transformed to give multiple transformed cell lines, and selecting a cell line from said transformed cell lines which produces more than 1000 units of interferon per milliliter when cultivated at a cell density of 10 6 cells per milliliter in the absence of any interferon inducer.
Claim 3
Dependent Claim
91 words
A process for the production of human interferon, which comprises: culturing a cell line derived from a human lymphocyte isolated from a human infant from birth up to about two years, a new-born infant, or an aborted human fetus that has been transformed with Epstein Barr Virus, wherein said culturing occurs in the absence of any interferon inducer and said cell line produces more than 1000 units of interferon per milliliter when cultivated at a cell density of 10 6 cells per milliliter, and isolating human interferon from said culture medium.
Claim 4
Dependent Claim
91 words
A process for the production of human interferon, which comprises: culturing a cell line derived from a human lymphocyte isolated from a human infant from birth up to about two years, a new-born infant, or an aborted human fetus that has been transformed with Epstein Barr Virus, wherein said culturing occurs in the absence of any interferon inducer and said cell line produces more than 1000 units of interferon per milliliter when cultivated at a cell density of 10 6 cells per milliliter, and isolating human interferon from said culture medium.
References Cited (Backward Citations)
US3773924A
Cited
EP0000520A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |