US2451098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil purifying system for vacuum pumps
Assignee: Hilliard Corp
•
Filing: 1945-01-13
•
Granted: 1948-10-12
•
Expires: 1965-01-13
Abstract
No abstract record available.
Inventors
- 👤 Brecque Theodore A La
- 👤 Arvid W Skoog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:53
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1626557A
Cited
US1520248A
Cited
US1720310A
Cited
US2077038A
Cited
US2227441A
Cited
US2127474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |