US3761386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel membrane spacer
Assignee: LEA MANUFACTURING COMPANY A CT CORP
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Filing: 1971-08-02
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Granted: 1973-09-25
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Expires: 1991-08-02
Abstract
Abstract A novel spacer suitable for use in electrodialysis processes and novel electrodialysis apparatus utilizing the spacer. The spacer comprises a tortuous flow path having a turbulence-promoting grid therein wherein said flow path is formed in a sheet of material and wherein said grid extends beyond said flow path into said sheet, thereby reinforcing the sheet.
Inventors
- 👤 J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:45
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50; B01D2313/00; B01D2313/08; B01D2313/086; B01D2313/14
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |