US3473548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrohydraulic servo mechanism
Assignee: DONALD W ERICKSON
•
Filing: 1966-12-19
•
Granted: 1969-10-21
•
Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Donald W Erickson
- 👤 Ernest C Thornber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:11
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; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659; Y10T137/86598
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1125825A
Cited
US2618244A
Cited
US2771907A
Cited
US3209782A
Cited
US2851997A
Cited
US2977985A
Cited
US3060969A
Cited
FR1272779A
Cited
US3167632A
Cited
US3163180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |