US3600147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a glass semipermeable membrane
Assignee: CHARLES I COHEN
•
Filing: 1970-01-02
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Granted: 1971-08-17
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Expires: 1990-01-02
Abstract
Abstract A PROCESS OF MAKING A SEMIPERMEABLE MEMBRANE THAT INCLUDES LEACHING AN INORGANIC GLASS FILM.
Inventors
- 👤 Charles L Mckinnis
- 👤 Charles I Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:30
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0074; B01D71/00; B01D71/02; B01D71/024; B01D71/027; C; C03; C03C; C03C15/00; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; B01D2323/00; B01D2323/12; Y; Y10; Y10S; Y10S65/00; Y10S65/05
Claims Analysis
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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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |