Patent US3519371A successfully refreshed from Google Patents.
US3519371A
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Multistage mechanical vacuum pumping arrangements
Assignee: Edwards High Vacuum International Ltd
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Filing: 1968-09-18
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Granted: 1970-07-07
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Expires: 1988-09-18
Abstract
No abstract record available.
Inventors
- 👤 Leslie Arthur Holland
- 👤 Malcolm Arthur Baker
- 👤 Laurence Laurenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:39
CPC Classifications
F; F04; F04C; F04C23/00; F04B; F04B39/00; F04B39/04; F04B41/00; F04B41/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2636655A
Cited
US2902210A
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US2935243A
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US2968160A
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US3007624A
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US3085913A
Cited
US3353742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |