US3441142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonthrombogenic plastic membranes
Assignee: Dow Chemical Co
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Filing: 1966-07-21
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Granted: 1969-04-29
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Expires: 1986-07-21
Abstract
No abstract record available.
Inventors
- 👤 Phyllis D Oja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/10; A; A61; A61L; A61L33/00; A61L33/0005; A61L33/0011; A61L33/0023; B01D67/00; B01D67/0081; B01D67/0093; B01D71/12; C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |