US2640841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining and bleaching of sugar cane wax
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1951-04-17
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Granted: 1953-06-02
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Expires: 1971-04-17
Abstract
No abstract record available.
Inventors
- 👤 Hatt Harold Herbert
- 👤 Strasser Peter Hermann Alois
- 👤 Troyahn William John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:08
CPC Classifications
C; C11; C11B; C11B11/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
A METHOD OF REFINING SUGAR CANE WAX, COMPRISING THE DISTILLING OF UNDESIRABLE COMPONENTS FROM THE CRUDE WAX UNDER A PRESSURE NOT GREATER THAN ABOUT 6 MILLIMETERS OF MERCURY IN AN INERT ATMOSPHERE AND AT A TEMPERATURE WHICH RISES ABOVE 250* C. AND DOES NOT EXCEED 325* C. AND WHICH IS MAINTAINED WITHIN THAT RANGE UNTIL THE DESIRED PROPORTION OF DISTILLATE HAS PASSED OFF.
Claim 2
Independent Claim
63 words
A METHOD OF REFINING SUGAR CANE WAX, COMPRISING THE DISTILLING OF UNDESIRABLE COMPONENTS FROM THE CRUDE WAX UNDER A PRESSURE NOT GREATER THAN ABOUT 6 MILLIMETERS OF MERCURY IN AN INERT ATMOSPHERE AND AT A TEMPERATURE WHICH RISES ABOVE 250* C. AND DOES NOT EXCEED 325* C. AND WHICH IS MAINTAINED WITHIN THAT RANGE UNTIL THE DESIRED PROPORTION OF DISTILLATE HAS PASSED OFF.
Claim 3
Dependent Claim
31 words
A METHOD OF REFINING SUGAR CANE WAX AS CLAIMED IN CLAIM 1, AND IN WHICH THE WAX WHICH REMAINS AS THE RESIDUE IS BLEACHED BY CHROMIC ACID IN SULPHURIC ACID SOLUTION.
References Cited (Backward Citations)
GB191501332A
Cited
US2401338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |