US3412646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating piston type motor systems
Assignee: RUFUS B JOHNSTON
•
Filing: 1965-06-28
•
Granted: 1968-11-26
•
Expires: 1985-06-28
Abstract
No abstract record available.
Inventors
- 👤 Rufus B Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04; F15; F15B; F15B11/00; F15B11/08; F15B11/15
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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |