US2552604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure control for variable delivery pump hydraulic drive system control
Assignee: LUDWIG VON ROLL SCHEN IRON WOR
•
Filing: 1947-12-31
•
Granted: 1951-05-15
•
Expires: 1967-12-31
Abstract
No abstract record available.
Inventors
- 👤 Thoma Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:27
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/26; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41509; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/45; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/715; F15B2211/76
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |