US3784470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite coiled membrane assembly
Assignee: Occidental Chemical Corp
•
Filing: 1972-11-20
•
Granted: 1974-01-08
•
Expires: 1992-11-20
Abstract
Abstract Separate lengths of semipermeable membrane suitable for reverse osmosis and ultrafiltration are connected to each other by a short, strong connector assembly. The resulting assembly is wound into a spool shaped housing in a helical multi-layered coil. A compressible or elastomeric pad separates the inner diameter of the coil from the hub of the housing to absorb dimensional changes caused by pressurization of the membrane during its operation in a reverse osmosis system. The connector assembly preferably includes soft elastomeric extensions on each end of an inner member which fits inside the connected ends of the membrane to dissipate stress concentrations.
Inventors
- 👤 J Richardson
- 👤 G Segovia
- 👤 W Bachle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/068
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |