Patent US2311851A successfully refreshed from Google Patents.
Patent US2411118A successfully refreshed from Google Patents.
US2844158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-hydraulic servo actuators
Assignee: Ex-Cell-O Corp
•
Filing: 1955-08-29
•
Granted: 1958-07-22
•
Expires: 1975-08-29
Abstract
No abstract record available.
Inventors
- 👤 Carson Thomas Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0438; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1611961A
Cited
US1973769A
Cited
US1992048A
Cited
US2601867A
Cited
US2584455A
Cited
US2742916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |