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Patent US2814540A successfully refreshed from Google Patents.
US2814540A
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Piston packing
Assignee: Blackhawk Manufacturing Co
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Filing: 1956-07-16
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Granted: 1957-11-26
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Expires: 1976-07-16
Abstract
No abstract record available.
Inventors
- 👤 Harold I Southerwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:46
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3208
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1955157A
Cited
GB544910A
Cited
US2658809A
Cited
GB646249A
Cited
US2666659A
Cited
US2701172A
Cited
US2708573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |