US3488718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration of hydrous oxides
Assignee: Wyeth Holdings LLC
•
Filing: 1963-12-16
•
Granted: 1970-01-06
•
Expires: 1983-12-16
Abstract
No abstract record available.
Inventors
- 👤 William B Innes
- 👤 Emerson V Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:58
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/02; B01J; B01J20/00; B01J20/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1755379A
Cited
US2149748A
Cited
US2351259A
Cited
US2995512A
Cited
US2728725A
Cited
US2981630A
Cited
US2625529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |