Patent US3174889A successfully refreshed from Google Patents.
US3174889A
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US
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Method of making a porous coated product
Assignee: Riegel Paper Corp
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Filing: 1957-02-18
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Granted: 1965-03-23
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Expires: 1977-02-18
Abstract
No abstract record available.
Inventors
- 👤 William E Anderson
- 👤 George C Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:51
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/06; B32B27/00; B32B27/06; B32B27/10; D; D21; D21H; D21H27/00; D21H27/30; D21H27/32; D21H27/34; D21H27/36; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1059; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249962; Y10T428/249964; Y10T428/249965; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/249993; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
165 words
A METHOD OF MAKING A POROUS COATED PRODUCT, COMPRISING FORMING A LAMINATE CONSISTING ESSENTIALLY OF TWO LAYERS OF POROUS WEB MATERIAL AND AN INTERMADIATE FILM OF NORMALLY NON-POROUS THERMOPLASTIC MATERIAL, THE SAID LAMINATE BEING FORMED WHILE SAID THERMOPLASTIC MATERIAL IS IN A SOFTENED AND TACKY CONDITION, AND THEREAFTER PULLING THE TWO WEBS APART WHILE THE THERMOPLASTIC MATERIAL IS IN A HEAT-SOFTENED CONDITION TO LEAVE PORTIONS OF THE THERMOPLASTIC MATERIAL ADHERED TO EACH WEB, THE CHARACTER OF THE THERMOPLASTIC MATERIAL AND THE POROUS WEBS BEING SUCH THAT THE BOND STRENGTH OF THE THERMOPLASTIC MATERIAL WITH THE PAPER WEBS EXCEEDS THE COHESIVE STRENGTH OF THE THERMOPLASTIC MATERIAL WHILE SAID THERMOPLASTIC MATERIAL IS IN A HEAT-SOFTENED CONDITION, AND THE WEIGHT AND CHARACTER OF THE THERMOPLASTIC MATERIAL BEING SUCH THAT, UPON THE PULLING APART OF THE WEBS IN THE PRESENCE OF HEAT, MMUTE OPENINGS ARE FORMED IN THE NORMALLY NON-POROUS THERMOPLASTIC MATERIAL WHICH EXTEND THROUGH TO THE POROUS WEB MATERIAL TO PROVIDE A PAIR OF HIGHLY POROUS COATED WEBS.
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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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |