US3523879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for material extraction
Assignee: Worcester Foundation for Biomedical Research
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Filing: 1966-08-25
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Granted: 1970-08-11
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Expires: 1986-08-25
Abstract
No abstract record available.
Inventors
- 👤 Julio M Cortes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:43
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D11/00; B01D11/02; B01D11/0211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB285417A
Cited
US1972561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |