US2982271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas producer of the freee-piston type and method for starting and operating the same
Assignee: Individual
•
Filing: 1956-04-23
•
Granted: 1961-05-02
•
Expires: 1976-04-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Heintz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:47
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02B71/06; F02B71/02; F02C; F02C5/00; F02C5/06; F02C5/08; F16; F16K; F16K15/00; F16K15/14; F16K15/1401; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7859
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) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |