US2978284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston head structure
Assignee: Individual
•
Filing: 1957-03-19
•
Granted: 1961-04-04
•
Expires: 1977-03-19
Abstract
No abstract record available.
Inventors
- 👤 Daub Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:14
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49265; Y10T29/49826; Y10T29/49908; Y10T29/49936; Y10T29/49945
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1781207A
Cited
US2124360A
Cited
GB460420A
Cited
US2229578A
Cited
US2620530A
Cited
US2563853A
Cited
US2685729A
Cited
US2716581A
Cited
FR1066931A
Cited
US2851317A
Cited
US2815255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |