US2938901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical dusting powder and process therefor
Assignee: Unilever Bestfoods North America
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Filing: 1956-11-23
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Granted: 1960-05-31
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Expires: 1976-11-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Kerr
- 👤 Jr Frank C Cleveland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:05
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/06; C08B31/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PROCESS FOR MAKING AN INERT DUSTING POWDER WHICH COMPRISES TREATING UNSWOLLEN GRANULE STARCH IN AQUEOUS SLURRY WITH A WATER SOLUBLE SALT FROM THE GROUP CONSISTING OF METAPHOSPHATES AND POLYMETAPHOSPHATES IN AN AMOUNT WITHIN THE RANGE OF ABOUT 0.01 TO ABOUT 3.0 PERCENT, BASED ON THE DRY WEIGHT OF THE STARCH, AT A TEMPERATURE SUFFICIENTLY LOW TO MAINTAIN THE STARCH IN UNSWOLLEN GRANULE STATE, AND NOT FOR A TIME SUFFICIENT TO ESTERIFY THE STARCH TO THE DEGREE WHERE IT IS SUBSTANTIALLY NONGELATINIZABLE IN BOILING WATER, THE PH OF THE SYSTEM BEING MAINTAINED WITHIN THE RANGE OF ABOUT 9.0 TO ABOUT 11.6, ADDING HYDROCHLORIC ACID TO LOWER THE PH TO ABOUT 6.5, THEN ADDING A WATER SOLUBLE CALCIUM SALT AND WASHING AND DRYING THE RESULTANT PRODUCT.
Claim 2
Dependent Claim
125 words
A PROCESS FOR MAKING AN INERT DUSTING POWDER WHICH COMPRISES TREATING UNSWOLLEN GRANULE STARCH IN AQUEOUS SLURRY WITH A WATER SOLUBLE SALT FROM THE GROUP CONSISTING OF METAPHOSPHATES AND POLYMETAPHOSPHATES IN AN AMOUNT WITHIN THE RANGE OF ABOUT 0.01 TO ABOUT 3.0 PERCENT, BASED ON THE DRY WEIGHT OF THE STARCH, AT A TEMPERATURE SUFFICIENTLY LOW TO MAINTAIN THE STARCH IN UNSWOLLEN GRANULE STATE, AND NOT FOR A TIME SUFFICIENT TO ESTERIFY THE STARCH TO THE DEGREE WHERE IT IS SUBSTANTIALLY NONGELATINIZABLE IN BOILING WATER, THE PH OF THE SYSTEM BEING MAINTAINED WITHIN THE RANGE OF ABOUT 9.0 TO ABOUT 11.6, ADDING HYDROCHLORIC ACID TO LOWER THE PH TO ABOUT 6.5, THEN ADDING A WATER SOLUBLE CALCIUM SALT AND WASHING AND DRYING THE RESULTANT PRODUCT.
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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |