US3223004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cup-shaped articles
Assignee: Arrowhead Engineering Corp
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Filing: 1958-08-20
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Granted: 1965-12-14
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Expires: 1978-08-20
Abstract
No abstract record available.
Inventors
- 👤 Frank J Sabo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:21
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PISTON, COMPRISING CIRCUMFERENTIALLY CONTINUOUS WALLS OF ALUMINUM FORMING A HOLLOW CYLINDRICAL MEMBER, A DISC-SHAPED MEMBER JOINED INTEGRALLY AT ITS ENTIRE MARGINAL EDGE TO SAID WALLS AT ONE END OF SAID CYLINDRICAL MEMBER AND BEING THICKER ADJACENT ITS EDGES THAN AT ITS CENTER, AN ANNULAR GROOVE IN THE INTERNAL SURFACE OF SAID SIDE WALL ADJACENT SAID DISC-SHAPED MEMBER, AND A STEEL DISC-SHAPED INSERT IN CONTACT WITH THE INNER SURFACE OF SAID DISC-SHAPED MEMBER SEATED AT ITS MARGINAL EDGE IN SAID GROOVE AND HAVING ON ITS UPPER SURFACE A CENTRAL RECESS AND AN ANNULAR RIDGE SPACED FROM AND CONCENTRIC WITH SAID CENTRAL RECESS AND HAVING ON ITS LOWER SURFACE A CENTRAL PROTRUSION AND AN ANNULAR GROOVE SPACED FROM AND CONCENTRIC WITH SAID CENTRAL PROTRUSION.
Claim 2
Dependent Claim
123 words
A PISTON, COMPRISING CIRCUMFERENTIALLY CONTINUOUS WALLS OF ALUMINUM FORMING A HOLLOW CYLINDRICAL MEMBER, A DISC-SHAPED MEMBER JOINED INTEGRALLY AT ITS ENTIRE MARGINAL EDGE TO SAID WALLS AT ONE END OF SAID CYLINDRICAL MEMBER AND BEING THICKER ADJACENT ITS EDGES THAN AT ITS CENTER, AN ANNULAR GROOVE IN THE INTERNAL SURFACE OF SAID SIDE WALL ADJACENT SAID DISC-SHAPED MEMBER, AND A STEEL DISC-SHAPED INSERT IN CONTACT WITH THE INNER SURFACE OF SAID DISC-SHAPED MEMBER SEATED AT ITS MARGINAL EDGE IN SAID GROOVE AND HAVING ON ITS UPPER SURFACE A CENTRAL RECESS AND AN ANNULAR RIDGE SPACED FROM AND CONCENTRIC WITH SAID CENTRAL RECESS AND HAVING ON ITS LOWER SURFACE A CENTRAL PROTRUSION AND AN ANNULAR GROOVE SPACED FROM AND CONCENTRIC WITH SAID CENTRAL PROTRUSION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |