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Patent US3353742A successfully refreshed from Google Patents.
US3353742A
Expired / Lapsed
US
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Back-streaming control in a diffusion pump
Assignee: Individual
•
Filing: 1965-10-14
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Granted: 1967-11-21
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Expires: 1985-10-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Bowman
- 👤 Patrick B Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:38
CPC Classifications
F; F04; F04F; F04F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US655274A
Cited
US1874537A
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US2437849A
Cited
US2438387A
Cited
US2886235A
Cited
US3251537A
Cited
US3258196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |