US3524757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating a tube to form a semipermeable membrane
Assignee: HAVENS INTERN
•
Filing: 1964-06-15
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Granted: 1970-08-18
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Glenn G Havens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:25
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D71/16; B01D69/00; B01D69/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1057823A
Cited
US1956722A
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US2126556A
Cited
US3108012A
Cited
US3133132A
Cited
US3157244A
Cited
US3301736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |