Patent US2821459A successfully refreshed from Google Patents.
US2821459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drying latex-spun products
Assignee: Dow Chemical Co
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Filing: 1955-06-17
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Granted: 1958-01-28
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Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:36
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/06; D01D10/00; D01D10/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A METHOD FOR PRODUCING CONTINUOUS THIN ORIENTED ARTICLES FROM AQUEOUS LATEXES OF NORMALLY CRYSTALLINE POLYMERS COMPRISING THE STEPS OF EXTRUDING A LATEX INTO AN ELECTROLYTE COAGULANT TO COAGULATE THE LATEX TO FORM A CONTINUOUS THIN ARTICLE, WASHING THE SO-FORMED ARTICLE, AND DRYING AND THEN ORIENTING IT BY STRETCHING, THE IMPROVEMENT CONSISTING OF ADVANCING THE WASHED BUT UNDRIED ARTICLE ACROSS THE SURFACE OF A HEATED LIQUID BATH OF AN ORGANIC, WATER-MISCIBLE MATERIAL WHICH WETS BUT IS A NON-SOLVENT FOR SAID POLYMER AND WHOSE BOILING POINT AT ATMOSPHERIC PRESSURE IS AT LEAST 100*C., AND WHICH HAS A DENSITY SUCH THAT SAID POLYMERIC ARTICLE MAY BE FLOATED THEREON, THE TEMPERATURE OF SAID BATH BEING AT LEAST 100*C., BUT BELOW THE SOFTENING POINT OF THE POLYMER, AND THEREAFTER FUSING, COOLING AND STRETCHING THE ARTICLE TO EFFECT ORIENTATION.
Claim 2
Dependent Claim
134 words
IN A METHOD FOR PRODUCING CONTINUOUS THIN ORIENTED ARTICLES FROM AQUEOUS LATEXES OF NORMALLY CRYSTALLINE POLYMERS COMPRISING THE STEPS OF EXTRUDING A LATEX INTO AN ELECTROLYTE COAGULANT TO COAGULATE THE LATEX TO FORM A CONTINUOUS THIN ARTICLE, WASHING THE SO-FORMED ARTICLE, AND DRYING AND THEN ORIENTING IT BY STRETCHING, THE IMPROVEMENT CONSISTING OF ADVANCING THE WASHED BUT UNDRIED ARTICLE ACROSS THE SURFACE OF A HEATED LIQUID BATH OF AN ORGANIC, WATER-MISCIBLE MATERIAL WHICH WETS BUT IS A NON-SOLVENT FOR SAID POLYMER AND WHOSE BOILING POINT AT ATMOSPHERIC PRESSURE IS AT LEAST 100*C., AND WHICH HAS A DENSITY SUCH THAT SAID POLYMERIC ARTICLE MAY BE FLOATED THEREON, THE TEMPERATURE OF SAID BATH BEING AT LEAST 100*C., BUT BELOW THE SOFTENING POINT OF THE POLYMER, AND THEREAFTER FUSING, COOLING AND STRETCHING THE ARTICLE TO EFFECT ORIENTATION.
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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |