US3403203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a non-woven fabric-like member
Assignee: WR Grace and Co
•
Filing: 1964-03-13
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Granted: 1968-09-24
•
Expires: 1984-03-13
Abstract
No abstract record available.
Inventors
- 👤 Henry G Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:27
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/426; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; D01D5/24; D01D5/247; D04; D04H; D04H13/00; B29L; B29L2023/00; Y; Y10; Y10S; Y10S264/00; Y10S264/08; Y10S264/13; Y10S264/47; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A METHOD FOR PREPARING A NON-WOVEN FABRIC-LIKE MEMBER COMPRISING (A) INTIMATELY ADMIXING A NORMALLY SOLID THERMOPLASTIC POLYMERIC MATERIAL AND A BLOWING AGENT WHICH PRODUCES A NORMALLY GASEOUS MATERIAL AT ELEVATED TEMPERTURES; (B) HEATING SAID ADMIXTURE IN A CONFINED ZONE AT A TEMPERATURE ABOVE THE SOFTENING POINT OF SAID POLYMER AND AT AN ELEVATED PRESSURE SUFFICIENT TO PREVENT EXPANSION OF THE BLOWING AGENT GAS; (C) EXTRUDING SAID ADMIXTUE THROUGH AN ANNULAR DIE INTO AN AREA OF REDUCED PRESSURE THEREBY FORMING A TUBULAR SHAPED CELLULAR STRUCTURE; (D) IMMEDIATELY INFLATING SAID TUBE BY INTERIORLY APPLYING FLUID PRESSURE SUFFICIENT TO RUPTURE A SUBSTANTIAL PORTION OF THE CELLS AND FORM A NON-WOVEN FABRICLIKE MEMBER; (E) RESTRICTING THE FLOW OF FLUID FROM WITHIN THE INFLATED TUBE THROUGH THE RESULTANT POROUS FABRIC-LIKE MEMBER BY ENCLOSING AT LEAST THE PORTION OF THE INFLATED TUBE WITH RUPTURED CELLS WITH A FLUID IMPERMEABLE MEMBER TO REDUCE THE LOSS OF FLUID PRESSURE; AND (F) DEFLATING AND COOLING SAID TUBE BELOW THE SOFTENING POINT THEREOF.
Claim 2
Independent Claim
163 words
A METHOD FOR PREPARING A NON-WOVEN FABRIC-LIKE MEMBER COMPRISING (A) INTIMATELY ADMIXING A NORMALLY SOLID THERMOPLASTIC POLYMERIC MATERIAL AND A BLOWING AGENT WHICH PRODUCES A NORMALLY GASEOUS MATERIAL AT ELEVATED TEMPERTURES; (B) HEATING SAID ADMIXTURE IN A CONFINED ZONE AT A TEMPERATURE ABOVE THE SOFTENING POINT OF SAID POLYMER AND AT AN ELEVATED PRESSURE SUFFICIENT TO PREVENT EXPANSION OF THE BLOWING AGENT GAS; (C) EXTRUDING SAID ADMIXTUE THROUGH AN ANNULAR DIE INTO AN AREA OF REDUCED PRESSURE THEREBY FORMING A TUBULAR SHAPED CELLULAR STRUCTURE; (D) IMMEDIATELY INFLATING SAID TUBE BY INTERIORLY APPLYING FLUID PRESSURE SUFFICIENT TO RUPTURE A SUBSTANTIAL PORTION OF THE CELLS AND FORM A NON-WOVEN FABRICLIKE MEMBER; (E) RESTRICTING THE FLOW OF FLUID FROM WITHIN THE INFLATED TUBE THROUGH THE RESULTANT POROUS FABRIC-LIKE MEMBER BY ENCLOSING AT LEAST THE PORTION OF THE INFLATED TUBE WITH RUPTURED CELLS WITH A FLUID IMPERMEABLE MEMBER TO REDUCE THE LOSS OF FLUID PRESSURE; AND (F) DEFLATING AND COOLING SAID TUBE BELOW THE SOFTENING POINT THEREOF.
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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) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |