US4995930A
Expired / Lapsed
US
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Process for the production of a film combination
Assignee: Unilever Patent Holdings BV
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Filing: 1986-06-16
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Granted: 1991-02-26
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Expires: 2006-06-16
Abstract
Abstract A process for the production of a film combination consisting of a perforated plastic film and a fibrous material, which are laminated together by means of the pneumatic vacuum used to perforate the film when it is in a thermoplastic condition.
Inventors
- 👤 Winfried Merz
- 👤 Theo Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B26; B26F; B26F1/00; B26F1/26; B32B27/32; B32B3/00; B32B3/26; B32B3/266; B32B37/00; B32B37/04; B32B37/12; B32B37/1284; B32B37/1292; B32B38/00; B32B38/0032; B32B38/04; B32B38/06; B32B2038/047; B32B2305/00; B32B2305/10; B32B2305/18; B32B2323/00; B32B2323/04; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T156/1039; Y10T156/1041; Y10T156/1043; Y10T156/1044; Y10T156/1052; Y10T156/1056; Y10T156/1057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A process for producing a film combination comprising a web of porous fibrous material having a plastic film bonded thereto, said process comprising extruding a plastic film, feeding the extruded film while it is still in a thermoplastic condition onto a sievelike rotating surface, applying a web of fibrous material against a face of the plastic film that faces away from the sievelike surface as the film is fed onto the rotating surface and applying a pneumatic vacuum to the resulting film web combination through the sievelike rotating surface so that the film is simultaneously perforated and cooled and bonded to the web.
Claim 2
Dependent Claim
103 words
A process for producing a film combination comprising a web of porous fibrous material having a plastic film bonded thereto, said process comprising extruding a plastic film, feeding the extruded film while it is still in a thermoplastic condition onto a sievelike rotating surface, applying a web of fibrous material against a face of the plastic film that faces away from the sievelike surface as the film is fed onto the rotating surface and applying a pneumatic vacuum to the resulting film web combination through the sievelike rotating surface so that the film is simultaneously perforated and cooled and bonded to the web.
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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |