US2971508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grate
Assignee: Riley Power Inc
•
Filing: 1957-12-26
•
Granted: 1961-02-14
•
Expires: 1977-12-26
Abstract
No abstract record available.
Inventors
- 👤 Russell C Rivers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:34
CPC Classifications
F; F23; F23H; F23H9/00; F23H9/04; F23H2900/00; F23H2900/09041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |