US3513974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indexing filter screening apparatus and method
Assignee: C A DAUER CO Inc
•
Filing: 1967-10-31
•
Granted: 1970-05-26
•
Expires: 1987-10-31
Abstract
No abstract record available.
Inventors
- 👤 John P Markwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:56
CPC Classifications
B; B01; B01D; B01D35/00; B01D29/00; B01D29/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2081009A
Cited
US2688406A
Cited
US2921687A
Cited
US3075646A
Cited
GB917182A
Cited
US3225928A
Cited
US3303635A
Cited
US3391786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |