Patent US6758685B1 successfully refreshed from Google Patents.
US3069855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-pneumatic systems for operating reversible torque actuators
Assignee: Philadelphia Gear Corp
•
Filing: 1961-01-26
•
Granted: 1962-12-25
•
Expires: 1981-01-26
Abstract
No abstract record available.
Inventors
- 👤 Walter J Denkowski
- 👤 Samuel I Caldwell
- 👤 Harold O Kron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:21
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/0725; F15B13/00; F15B13/10; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20576; F15B2211/21; F15B2211/216; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50527; F15B2211/50563; F15B2211/515; F15B2211/5151; F15B2211/5152; F15B2211/52; F15B2211/528; F15B2211/80; F15B2211/86; F15B2211/863; F15B2211/8633; F15B2211/875; F15B2211/8757
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2145540A
Cited
US2037434A
Cited
US2243648A
Cited
US2239893A
Cited
US2371450A
Cited
US2422357A
Cited
US2573993A
Cited
US2791093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |