Patent US2368233A successfully refreshed from Google Patents.
US3398505A
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Dual stage membrane gas separators with variable conductance means for varying their throughput
Assignee: Varian Medical Systems Inc
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Filing: 1967-03-27
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Granted: 1968-08-27
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Expires: 1987-03-27
Abstract
No abstract record available.
Inventors
- 👤 Peter M Llewellyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:19
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/72; G01N30/7206; G01N30/722; G01N1/00; G01N1/28; G01N1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |