US2452503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring
Assignee: PERFECT CIRCLE Co
•
Filing: 1944-06-21
•
Granted: 1948-10-26
•
Expires: 1964-06-21
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Teetor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:36
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/062; F16J9/12; F16J9/20; F16J9/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1767711A
Cited
US2290499A
Cited
US2224338A
Cited
US2239376A
Cited
US2273691A
Cited
US2346896A
Cited
US2346204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |