Patent US3346682A successfully refreshed from Google Patents.
US3346682A
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Method for making a filtering medium from plexifilamentary material
Assignee: EIDP Inc
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Filing: 1962-03-16
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Granted: 1967-10-10
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Expires: 1982-03-16
Abstract
No abstract record available.
Inventors
- 👤 Thomson Richard Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:54
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D2239/00; B01D2239/10; Y; Y10; Y10S; Y10S264/00; Y10S264/08; Y10S264/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR MAKING A TOBACCO SMOKE FILTERING MATERIAL COMPRISING FLASH SPINNING A CRYSTALLINE SYNTHETIC POLYMER THROUGH AN ORIFICE TO FORM A PLEXIFILAMENTARY STRAND, INTERCEPTING THE STRAND AS IT ISSUES FROM THE ORIFICE BY AN OSCILLATING SURFACE SET AT ANGLE TO THE DIRECTION OF TRAVEL OF THE STRAND IN ORDER TO SPREAD THE STRAND INTO A WEB AND DIRECT THE WEB DOWNWARD TOWARD A MOVING COLLECTION SURFACE, COLLECTING THE WEB ON THE COLLECTION SURFACE IN OVERLAPPING, MULTI-DIRECTIONAL, INTERSECTING LAYERS TO FORM A SHEET, CALENDERING THE SHEET TO REDUCE ITS THICKNESS TO BELOW ABOUT 0.5 CM. AT A BASIS WEIGHT OF BETWEEN ABOUT 0.25 OZ./YD.2 AND 10 OZ./YD.2, SLITTING THE PRESSED SHEET INTO TAPES OF BETWEEN ABOUT 0.3 AND 10 INCHES IN WIDTH
Claim 2
Dependent Claim
122 words
A PROCESS FOR MAKING A TOBACCO SMOKE FILTERING MATERIAL COMPRISING FLASH SPINNING A CRYSTALLINE SYNTHETIC POLYMER THROUGH AN ORIFICE TO FORM A PLEXIFILAMENTARY STRAND, INTERCEPTING THE STRAND AS IT ISSUES FROM THE ORIFICE BY AN OSCILLATING SURFACE SET AT ANGLE TO THE DIRECTION OF TRAVEL OF THE STRAND IN ORDER TO SPREAD THE STRAND INTO A WEB AND DIRECT THE WEB DOWNWARD TOWARD A MOVING COLLECTION SURFACE, COLLECTING THE WEB ON THE COLLECTION SURFACE IN OVERLAPPING, MULTI-DIRECTIONAL, INTERSECTING LAYERS TO FORM A SHEET, CALENDERING THE SHEET TO REDUCE ITS THICKNESS TO BELOW ABOUT 0.5 CM. AT A BASIS WEIGHT OF BETWEEN ABOUT 0.25 OZ./YD.2 AND 10 OZ./YD.2, SLITTING THE PRESSED SHEET INTO TAPES OF BETWEEN ABOUT 0.3 AND 10 INCHES IN WIDTH
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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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |