US3507397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocyclone unit
Assignee: WILLIAM R ROBINSON
•
Filing: 1969-04-09
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Granted: 1970-04-21
•
Expires: 1989-04-09
Abstract
No abstract record available.
Inventors
- 👤 William R Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:49
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/02; B04C5/04; D; D21; D21D; D21D5/00; D21D5/18
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) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |