US2471983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic drive for rotary grates and the like
Assignee: United Engineers and Constructors Inc
•
Filing: 1944-02-01
•
Granted: 1949-05-31
•
Expires: 1964-02-01
Abstract
No abstract record available.
Inventors
- 👤 Floyd W Spahr
- 👤 John S Haug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:36
CPC Classifications
F; F16; F16H; F16H31/00; F16H31/003; F16H31/005; F15; F15B; F15B15/00; F15B15/02; F15B15/06; F15B15/061; F16C; F16C5/00; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1584
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) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |