Patent US2521704A successfully refreshed from Google Patents.
US2521704A
Expired / Lapsed
US
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Fibers from zein
Assignee: Individual
•
Filing: 1944-03-28
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Granted: 1950-09-12
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Expires: 1964-03-28
Abstract
No abstract record available.
Inventors
- 👤 Cyril D Evans
- 👤 Chester W Ofelt
- 👤 Allan K Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:16
CPC Classifications
D; D01; D01F; D01F4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF FORMING FIBERS COMPRISING COLD MIXING ZEIN WITH AN AQUEOUS ALKALI METAL HYDROXIDE TO PRODUCE A DISPERSION HAVING A PH RANGE OF ABOUT FROM 11 TO 12.8, THE PROPORTION OF ZEIN USED BEING SUCH AS TO GIVE A VISCOSITY OF ABOUT FROM 10 POISES TO 1,000 POISES, AND SPINNING THE DISPERSION IN A LIQUID COAGULATING ACID MEDIUM CONTAINING A STRONG MINERAL ACID AND AN ORGANIC ACID.
Claim 2
Dependent Claim
68 words
THE PROCESS OF FORMING FIBERS COMPRISING COLD MIXING ZEIN WITH AN AQUEOUS ALKALI METAL HYDROXIDE TO PRODUCE A DISPERSION HAVING A PH RANGE OF ABOUT FROM 11 TO 12.8, THE PROPORTION OF ZEIN USED BEING SUCH AS TO GIVE A VISCOSITY OF ABOUT FROM 10 POISES TO 1,000 POISES, AND SPINNING THE DISPERSION IN A LIQUID COAGULATING ACID MEDIUM CONTAINING A STRONG MINERAL ACID AND AN ORGANIC ACID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |