US3198865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of applying a microporous plastic membrane filter on a support
Assignee: EMD Millipore Corp
•
Filing: 1960-09-28
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Granted: 1965-08-03
•
Expires: 1980-09-28
Abstract
No abstract record available.
Inventors
- 👤 David B Porter
- 👤 Richard A Paine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:15
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/108; B01D63/00; B01D63/06; B01D63/062; B01D63/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF MANUFACTURING A FILTER SUPPORTED ON A PERFORATED SUPPORT, WHICH COMPRISES FORMING A THIN SOLID COATING OF A BASE MATERIAL UPON THE OUTER SURFACE OF THE SUPPORT AND OVER THE PERFORATIONS THERETO, APPLYING OVER THE BASE MATERIAL A PLASTIC FILM-FORMING SOLUTION, TREATING THE FILM-FORMING SOLUTION TO CONVERT IT INTO A THIN FLEXIBLE PLASTIC FILTER FILM HAVING SUBSTANTIALLY TRANSVERSE PORES OF EFFECTIVE DIAMETER LESS THAN TEN MICRONS UPON THE OUTER PERIPHERY OF THE BASE MATERIAL AND OVER SAID PERFORATIONS, AND REMOVING THE BASE MATERIAL WHILE LEAVING
Claim 2
Independent Claim
87 words
THE METHOD OF MANUFACTURING A FILTER SUPPORTED ON A PERFORATED SUPPORT, WHICH COMPRISES FORMING A THIN SOLID COATING OF A BASE MATERIAL UPON THE OUTER SURFACE OF THE SUPPORT AND OVER THE PERFORATIONS THERETO, APPLYING OVER THE BASE MATERIAL A PLASTIC FILM-FORMING SOLUTION, TREATING THE FILM-FORMING SOLUTION TO CONVERT IT INTO A THIN FLEXIBLE PLASTIC FILTER FILM HAVING SUBSTANTIALLY TRANSVERSE PORES OF EFFECTIVE DIAMETER LESS THAN TEN MICRONS UPON THE OUTER PERIPHERY OF THE BASE MATERIAL AND OVER SAID PERFORATIONS, AND REMOVING THE BASE MATERIAL WHILE LEAVING
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |