Patent US2521568A successfully refreshed from Google Patents.
US3042292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump with gas ballast device
Assignee: WC Heraus GmbH and Co KG
•
Filing: 1959-05-22
•
Granted: 1962-07-03
•
Expires: 1979-05-22
Abstract
No abstract record available.
Inventors
- 👤 Lorenz Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:31
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/02; F04C2220/00; F04C2220/50; F16; F16K; F16K2200/00; F16K2200/20; F16K2200/203; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7842
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |