Patent US2906448A successfully refreshed from Google Patents.
US2906448A
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US
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Roots type vacuum pumps
Assignee: W C HERAUS GmbH
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Filing: 1955-10-25
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Granted: 1959-09-29
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Expires: 1975-10-25
Abstract
No abstract record available.
Inventors
- 👤 Lorenz Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:26
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/06; F04C29/068; F04C29/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1038075A
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US1148809A
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US1905521A
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US2243874A
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US2107031A
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US2205984A
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US2578305A
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US2489887A
Cited
US2667046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |