US3715036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular osmotic membrane
Assignee: Individual
•
Filing: 1971-07-15
•
Granted: 1973-02-06
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Expires: 1991-07-15
Abstract
Abstract A REVERSE OSMOSIS PURIFICATION SYSTEM IN WHICH THE OSMOTIC MEMBRANE IS FORMED FROM A FLAT MEMBRANE WHICH IS CURLED AND LAP SEAMED. AN ADHESIVE IS EMPLOYED TO SEAL THE LAP SEAM. THE ADHESIVE DOES NOT PERMANENTLY BOND TOGETHER THE LAPPED SURFACES OF THE MEMBRANE UNTIL AFTER THE MEMBRANE IS POSITIONED IN CONTACT WITH THE SUPPORT TUBE AND FLUID PRESSURE IS APPLIED TO FORCE THE MEMBRANE INTO FIRM AND CONFORMING CONTACT WITH THE SUPPORT MEMBER.
Inventors
- 👤 E Hamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:15
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D71/16; B01D63/00; B01D63/06; B01D63/061; B01D63/062; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0013; B01D69/00; B01D69/04
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |