Patent US2937807A successfully refreshed from Google Patents.
US2937807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High vacuum pumps
Assignee: WC Heraus GmbH and Co KG
•
Filing: 1956-12-26
•
Granted: 1960-05-24
•
Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Lorenz Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:13
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/0042; F04C29/005; F04C29/02; F04C2240/00; F04C2240/50; F04C2240/51
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |