US3579400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of positioning a membrane
Assignee: Trane US Inc
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Filing: 1969-12-08
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Granted: 1971-05-18
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Expires: 1989-12-08
Abstract
Abstract A RESILIENT FILTRATION MEMBRANE IS INSERTED IN A POROUS SUPPORT TUBE BY WRAPPING THE MEMBRANE AROUND A RESILIENT TUBULAR MEMBER, AND HOLDING THE MEMBRANE IN PLACE AROUND THE TUBULAR MEMBER WHILE INSERTING THE MEMBRANE AND RESILIENT TUBULAR MEMBER INTO THE POROUS SUPPORT TUBE. THE RESILIENT MEMBER IS EXPANDED UNDER FLUID PRESSURE AND THEN RETURNED TO ITS NORMAL STATE LEAVING THE MEMBRANE AGAINST THE INTERIOR WALL OF THE POROUS SUPPORT. D R A W I N G
Inventors
- 👤 Anthony J Kanyok
- 👤 William H Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:59
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/04; B01D65/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |