Patent US2639205A successfully refreshed from Google Patents.
US2639205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expander for piston rings or the like
Assignee: Wilkening Manufacturing Co
•
Filing: 1948-06-03
•
Granted: 1953-05-19
•
Expires: 1968-06-03
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Wilkening
- 👤 Helmuth G Braendel
- 👤 Carl F Engelhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:15
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/063; F16J9/12; F16J9/14; F16J9/145
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1377151A
Cited
US1767711A
Cited
US2281873A
Cited
US2343942A
Cited
GB538681A
Cited
US2293450A
Cited
US2452503A
Cited
US2439702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |