US2449554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydropneumatic accumulator type power plant with differential speed motor
Assignee: Individual
•
Filing: 1938-04-19
•
Granted: 1948-09-21
•
Expires: 1958-04-19
Abstract
No abstract record available.
Inventors
- 👤 Carlyle L Helber
- 👤 Frederick B Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:29
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; B; B64; B64F; B64F1/00; B64F1/04; B64F1/06; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/3056; F15B2211/30565; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/329; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5151; F15B2211/55; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/76
Claims Analysis
Total Claims: 0
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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) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |