US3859402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making thin, microporous fluorocarbon polymer sheet material
Assignee: ESB Inc
•
Filing: 1973-11-19
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Granted: 1975-01-07
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Expires: 1993-11-19
Abstract
Abstract A process for making thin, microporous fluorcarbon polymer sheet material by mixing fluorocarbon polymer particles and metallic salt particles; forming the resultant mixture into a sheet material; and removing the metallic salt particles from the sheet material.
Inventors
- 👤 Lee I Bintliff
- 👤 Jack C Sklarchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A PROCESS FOR MAKING MICROPOROUS FLUOROCARBON POLYMER SHEET MATERIAL WHICH PROCESS COMPRISES MIXING FLUOROCARBON POLYMER PARTICLES WITH PARTICLES OF A METALIC SALT PORE-FORMER; FORMING THE RESULTANT MIXTURE INTO A SHEET MATERIAL; AND REMOVING SAID METALLIC SALT PORE FORMER, WHERIN THE FLUOROCARBON POLYMER PARTICLES ARE SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUOROETHYLENE, POLYTRIFLUOROETHYLENE, POLYVINYLFLUORIDE, POLYVINYLIDENEFLUROIDE, POLYTRIFLUOROCHLOROETHYLENE AND COPOLYMERS THEREOF.
Claim 2
Dependent Claim
58 words
A PROCESS FOR MAKING MICROPOROUS FLUOROCARBON POLYMER SHEET MATERIAL WHICH PROCESS COMPRISES MIXING FLUOROCARBON POLYMER PARTICLES WITH PARTICLES OF A METALIC SALT PORE-FORMER; FORMING THE RESULTANT MIXTURE INTO A SHEET MATERIAL; AND REMOVING SAID METALLIC SALT PORE FORMER, WHERIN THE FLUOROCARBON POLYMER PARTICLES ARE SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUOROETHYLENE, POLYTRIFLUOROETHYLENE, POLYVINYLFLUORIDE, POLYVINYLIDENEFLUROIDE, POLYTRIFLUOROCHLOROETHYLENE AND COPOLYMERS THEREOF.
Claim 3
Dependent Claim
29 words
A process according to claim 1 wherein the amount of pore-former present is from about 0.25 to about 5 parts by weight of pore-former per part of fluorocarbon polymer.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the sheet material has thickness of from about 1 to about 25 mils.
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein the metallic salt pore-former is selected from the group consisting of calcium formate, sodium chloride and sodium carbonate.
Claim 6
Dependent Claim
54 words
A process according to claim 1 comprising additionally the steps of cutting the sheet material into sections and stacking at least two such sections one upon another each of such sections being stacked at an angle approximately 90* to the preceding sheet in the stack, before the metallic salt pore former is removed therefrom.
Claim 7
Dependent Claim
29 words
A process according to claim 5 wherein the amount of pore-former present is from about 0.25 to about 5 parts by weight of pore-former per part of fluorocarbon polymer.
Claim 8
Dependent Claim
21 words
A process according to claim 5 wherein the sheet material has a thickness of from about 1 to about 25 mils.
Claim 9
Dependent Claim
25 words
A process according to claim 5 wherein the metallic salt pore-former is selected from the group consisting of calcium formate, sodium chloride and sodium carbonate.
Claim 10
Dependent Claim
33 words
A process according to claim 1 comprising additionally the step of heating the sheet material to a temperature sufficient to siter the fluorocarbon polymer particles, before the metallic salt pore-former is removed therefrom.
Claim 11
Dependent Claim
29 words
A process according to claim 9 wherein the amount of pore-former present is from about 0.25 to about 5 parts by weight of pore-former per part of fluorocarbon polymer.
Claim 12
Dependent Claim
21 words
A process according to claim 9 wherein the sheet material has a thickness of from about 1 to about 25 mils.
Claim 13
Dependent Claim
25 words
A process according to claim 9 wherein the metallic salt pore-former is selected from the group consisting of calcium formate, sodium chloride and sodium carbonate.
References Cited (Backward Citations)
US3281511A
Cited
US3518332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |