Patent US4855893A successfully refreshed from Google Patents.
US3051633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of chromium plating vented piston rings
Assignee: SPX Technologies Inc
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Filing: 1959-03-16
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Granted: 1962-08-28
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Expires: 1979-03-16
Abstract
No abstract record available.
Inventors
- 👤 Donald A Paull
- 👤 Donald J Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:38
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
THE METHOD OF CHROMIUM PLATING THE OUTER PERIPHERAL SURFACE OF A PISTON RING HAVING RADICAL SLOTS EXTENDING FROM SAID OUTER PERIPHERAL SURFACE TO THE INNER PERIPHERY THEREOF WHICH COMPRISES TEMPORARILY CLOSING SAID SLOTS ONLY AT THE INNER PERIPHERY OF THE RING BY APPLYING A LINER TO THE INNER PERIPHERAL SURFACE OF THE RING AND WHILE SAID SLOTS ARE THUS CLOSED, DEPOSITING BY ELECTROPLATING A METALLIC COATING OR COPPER ON THE OUTER PERIPHERAL SURFACE OF THE RING AND ON THE SIDE SURFACES OF THE SLOTS THEREIN AND THEREAFTER CHROMIUM PLATING THE OUTER PERIPHERAL SURFACE OF THE RING.
Claim 2
Independent Claim
96 words
THE METHOD OF CHROMIUM PLATING THE OUTER PERIPHERAL SURFACE OF A PISTON RING HAVING RADICAL SLOTS EXTENDING FROM SAID OUTER PERIPHERAL SURFACE TO THE INNER PERIPHERY THEREOF WHICH COMPRISES TEMPORARILY CLOSING SAID SLOTS ONLY AT THE INNER PERIPHERY OF THE RING BY APPLYING A LINER TO THE INNER PERIPHERAL SURFACE OF THE RING AND WHILE SAID SLOTS ARE THUS CLOSED, DEPOSITING BY ELECTROPLATING A METALLIC COATING OR COPPER ON THE OUTER PERIPHERAL SURFACE OF THE RING AND ON THE SIDE SURFACES OF THE SLOTS THEREIN AND THEREAFTER CHROMIUM PLATING THE OUTER PERIPHERAL SURFACE OF THE RING.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |