Patent US3477381A successfully refreshed from Google Patents.
US3477381A
Expired / Lapsed
US
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Turbo-molecular pump
Assignee: ARTHUR PFEIFFER HOCHVAKUUMTECHNIK GMBH
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Filing: 1967-12-27
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Granted: 1969-11-11
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Expires: 1987-12-27
Abstract
No abstract record available.
Inventors
- 👤 Willi Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
CPC Classifications
F; F04; F04D; F04D19/00; F04D19/02; F04D19/04; F04D19/042; F04D29/00; F04D29/26; F04D29/32; F04D29/321; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D29/544
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US764230A
Cited
GB190620818A
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US941411A
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US1072233A
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US1347327A
Cited
US2357279A
Cited
US2405190A
Cited
FR1121516A
Cited
US3168977A
Cited
US3189264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |