US3465887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsion bar skimmer
Assignee: Dorr Oliver Inc
•
Filing: 1969-01-03
•
Granted: 1969-09-09
•
Expires: 1989-01-03
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Cookney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:42
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/10; B01D21/12; B01D21/14; B01D21/24; B01D21/2427; B01D21/2433
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2611489A
Cited
US3314547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |