Patent US3546891A successfully refreshed from Google Patents.
US3546891A
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Vortex tube process and apparatus
Assignee: VORTEX COMPANY HOUSTON
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Filing: 1969-07-18
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Granted: 1970-12-15
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Expires: 1989-07-18
Abstract
No abstract record available.
Inventors
- 👤 Lancelot A Fekete
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:09
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; B; B04; B04C; B04C3/00; B04C3/04; F25B; F25B9/00; F25B9/02; F25B9/04; F25J3/06; F25J3/0605; F25J3/061; F25J3/063; F25J3/0635; F25J3/065; F25J2205/00; F25J2205/10; F25J2210/00; F25J2210/60; F25J2220/00; F25J2220/60; F25J2220/68; F25J2280/00; F25J2280/02
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) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |