US2829991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sterilizing starch granules with ethylene oxide
Assignee: Cerestar USA Inc
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Filing: 1956-06-20
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Granted: 1958-04-08
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Expires: 1976-06-20
Abstract
No abstract record available.
Inventors
- 👤 James W Evans
- 👤 Glen E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:26
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF TREATING STARCH GRANULES TO KILL BACTERIA AND MICRO-OGRANISMS WHICH COMPRISES THE STEPS OF ADDING STARCH GRANULES TO WATER TO FORM AN AQUEOUS SUSPENSION OF STARCH IN WHICH THE GRANULES ARE WIDELY DISPERSED AS INDIVIDUAL PARTICLES, ADDING ETHYLENE OXIDE TO THE AQUEOUS SUSPENSION IN THE PROPORTION BETWEEN ABOUT 0.5% TO 5.0% OF ETHYLENE OXIDE BY WEIGHT OF STARCH SOLIDS, MAINTAINING THE STARCH GRANULES IN AQUEOYS SLURRY ION THE PRESENCE OF THE ETHYLENE OXIDE FROM ABOUT 20 MINUTES TO ABOUT 24 HOURS AND THEN DRYING THE SLURRY AT A TEMPERATURE BELOW THE PASTING POINT OF THE STARCH GRANULES TO RECOVER GRANULES CONTAINING LESS THAN 75 FLAT SOUR SPORES FOR ANY ONE 10 GRAM SAMPLE.
Claim 2
Independent Claim
115 words
A METHOD OF TREATING STARCH GRANULES TO KILL BACTERIA AND MICRO-OGRANISMS WHICH COMPRISES THE STEPS OF ADDING STARCH GRANULES TO WATER TO FORM AN AQUEOUS SUSPENSION OF STARCH IN WHICH THE GRANULES ARE WIDELY DISPERSED AS INDIVIDUAL PARTICLES, ADDING ETHYLENE OXIDE TO THE AQUEOUS SUSPENSION IN THE PROPORTION BETWEEN ABOUT 0.5% TO 5.0% OF ETHYLENE OXIDE BY WEIGHT OF STARCH SOLIDS, MAINTAINING THE STARCH GRANULES IN AQUEOYS SLURRY ION THE PRESENCE OF THE ETHYLENE OXIDE FROM ABOUT 20 MINUTES TO ABOUT 24 HOURS AND THEN DRYING THE SLURRY AT A TEMPERATURE BELOW THE PASTING POINT OF THE STARCH GRANULES TO RECOVER GRANULES CONTAINING LESS THAN 75 FLAT SOUR SPORES FOR ANY ONE 10 GRAM SAMPLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |