US2520173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing unsupported films of tetrafluoroethylene polymers
Assignee: EIDP Inc
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Filing: 1948-01-14
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Granted: 1950-08-29
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Expires: 1968-01-14
Abstract
No abstract record available.
Inventors
- 👤 Sanders Philip Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:06
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE PROCESS OF PREPARING UNSUPPORTED FILMS OF POLYMERIC MATERIALS, WHICH COMPRISES COATING A SOLUBLE METAL SHEET WITH A SUSPENSION OF A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUORETHYLENE AND COPOYLYMERS OF TETRAFLUORETHYLENE AND ANOTHER POLYMERIZABLE ORGANIC COMPOUND CONTAINING AN ETHYLENIC DOUBLE BOND, EVAPORATING THE SUSPENDING MEDIUM, HEATING TO COALESCE THE PARTICLES OF THE POLYMERIC MATERIAL, COOLING, AND IMMERSING THE COATED METAL IN A BATH WHICH DISSOLVES THE METAL, THE ENTIRE PROCESS BEING CONDUCTED IN THE ABSENCE OF MECHANICAL PRESSURE AND THE SHEET OF SOLUBLE METAL BEING SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, COPPER, MAGNESIUM, ZINC, AND ALLOYS THEREOF.
Claim 2
Dependent Claim
101 words
THE PROCESS OF PREPARING UNSUPPORTED FILMS OF POLYMERIC MATERIALS, WHICH COMPRISES COATING A SOLUBLE METAL SHEET WITH A SUSPENSION OF A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUORETHYLENE AND COPOYLYMERS OF TETRAFLUORETHYLENE AND ANOTHER POLYMERIZABLE ORGANIC COMPOUND CONTAINING AN ETHYLENIC DOUBLE BOND, EVAPORATING THE SUSPENDING MEDIUM, HEATING TO COALESCE THE PARTICLES OF THE POLYMERIC MATERIAL, COOLING, AND IMMERSING THE COATED METAL IN A BATH WHICH DISSOLVES THE METAL, THE ENTIRE PROCESS BEING CONDUCTED IN THE ABSENCE OF MECHANICAL PRESSURE AND THE SHEET OF SOLUBLE METAL BEING SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, COPPER, MAGNESIUM, ZINC, AND ALLOYS THEREOF.
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |