Patent US3540213A successfully refreshed from Google Patents.
US3540213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic actuator and method
Assignee: Enerpac Tool Group Corp
•
Filing: 1968-09-19
•
Granted: 1970-11-17
•
Expires: 1988-09-19
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:14
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/0725; F15B15/00; F15B15/20; F15B15/22; F15B15/227; F15B2211/00; F15B2211/20; F15B2211/21; F15B2211/218; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/40515; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/455; F15B2211/46; F15B2211/60; F15B2211/615
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) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |