US3616236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of rhizobium strains resistant to drying
Assignee: AstraZeneca AB
•
Filing: 1968-06-24
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Granted: 1971-10-26
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Expires: 1988-06-24
Abstract
Abstract The production of Rhizobium strains having good infecting and nitrogen-fixing characteristics by cultivating the strain, then subjecting it to drying whereby those strains which are sensitive to drying are destroyed and those strains which are resistant to drying survive. The surviving strains are then recultivated and subjected to at least one more drying treatment.
Inventors
- 👤 Per Staffan Delin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:59
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/20; C12N1/04; C12N1/36; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/878
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
Method according to claim 1, wherein at least 90 percent of the bacteria in the culture are killed in the course of the drying treatment.
Claim 2
Dependent Claim
33 words
Method according to claim 1, wherein the drying and cultivation sequence is repeated until at least about 90 percent of the bacteria present survive a drying operation carried out at about 28* C.
Claim 3
Dependent Claim
24 words
Method according to claim 1, wherein the culture is dried by keeping it in a closed zone in the presence of a drying agent.
Claim 4
Dependent Claim
33 words
Method according to claim 4, wherein the drying and cultivation sequence is repeated until at least about 90 percent of the bacteria present survive a drying operation carried out at about 28* C.
Claim 5
Dependent Claim
12 words
Method according to claim 4, wherein the drying agent is silica gel.
Claim 6
Dependent Claim
13 words
Method according to claim 4, wherein the drying agent is dehydrated calcium sulfate.
Claim 7
Dependent Claim
11 words
Method according to claim 4, wherein the drying agent is bentonite.
Claim 8
Dependent Claim
40 words
Method according to claim 1, wherein during the drying treatment the culture is exposed to ultraviolet irradiation whereby bacteria strains which are sensitive to ultraviolet irradiation are destroyed to provide residual drying-resistant strains which are resistant also to ultraviolet irradiation.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |