US3494542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuging process and apparatus
Assignee: Pennwalt Corp
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Filing: 1968-05-27
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Granted: 1970-02-10
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Expires: 1988-05-27
Abstract
No abstract record available.
Inventors
- 👤 Walton H Craig
- 👤 Robert J Finkelston
- 👤 Dean E Humphrey
- 👤 Andre C Lavanchy
- 👤 Leonard Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:37
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20; B04B1/2016
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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |