US2999728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring assembly
Assignee: Perfect Circle Corp
•
Filing: 1957-03-27
•
Granted: 1961-09-12
•
Expires: 1977-03-27
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Estey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2220948A
Cited
US2397220A
Cited
US2713527A
Cited
US2795469A
Cited
US2775495A
Cited
US2817565A
Cited
US2830861A
Cited
US2893801A
Cited
US2886384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |