Patent US2770320A successfully refreshed from Google Patents.
US2770320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil bath air cleaner
Assignee: United Specialties Co
•
Filing: 1952-12-19
•
Granted: 1956-11-13
•
Expires: 1972-12-19
Abstract
No abstract record available.
Inventors
- 👤 John J Dreznes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:25
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/026
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1062942A
Cited
US1395833A
Cited
US1532730A
Cited
GB395814A
Cited
US2040376A
Cited
US2335428A
Cited
US2457321A
Cited
US2570623A
Cited
US2632477A
Cited
US2627935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |