US3548569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-liquid cyclone separator
Assignee: Shell USA Inc
•
Filing: 1969-08-14
•
Granted: 1970-12-22
•
Expires: 1989-08-14
Abstract
No abstract record available.
Inventors
- 👤 John C Jepsen
- 👤 James L Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:38
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/02; B04C5/04; B04B; B04B5/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |