Patent US2926835A successfully refreshed from Google Patents.
US2926835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump control apparatus
Assignee: WC Heraus GmbH and Co KG
•
Filing: 1957-01-14
•
Granted: 1960-03-01
•
Expires: 1977-01-14
Abstract
No abstract record available.
Inventors
- 👤 Lorenz Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/06; F04C23/00; F04C23/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1913557A
Cited
US1972986A
Cited
US2223827A
Cited
US2492075A
Cited
US2690291A
Cited
US2721694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |