Patent US3221718A successfully refreshed from Google Patents.
US3221718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston construction
Assignee: Continental Aviation and Engineering Corp
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Filing: 1964-01-09
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Granted: 1965-12-07
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Expires: 1984-01-09
Abstract
No abstract record available.
Inventors
- 👤 Walter F Isley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:56
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0675; F01; F01P; F01P3/00; F01P3/06; F01P3/08; F02B23/0603; F02F; F02F3/00; F02F3/16; F02F3/20; F02F3/22; F02B2275/00; F02B2275/14; F02B23/0645; F02B23/0648; F02B23/0651; F02B23/066; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN AN INTERNAL COMBUSTION ENGINE A PISTON ASSEMBLY COMPRISING, (A) A PISTON MEMBER HAVING AN UPPER PLANAR SURFACE HAVING A CENTRAL OPENING AND A SUBSTANTIALLY CYLINDRICAL RECESS PROVIDED IN SAID PISTON MEMBER IN REGISTRY WITH SAID OPENING AND DEFINED BY AN INNER SUBSTANTIALLY ANNULAR SURFACE, (B) A TOP MEMBER EXTENDING ENTIRELY ACROSS SAID UPPER PLANAR SURFACE AND HAVING A LOWER SURFACE SECURED TO SAID UPPER SURFACE, (C) SAID TOP MEMBER HAVING A CENTRAL PORTION DEFINING A COMBUSTION CHAMBER CAVITY AND EXTENDING THROUGH SAID OPENING AND INTO SAID RECESS, (D) SAID COMBUSTION CHAMBER CAVITY BEING IN THE FORM OF THE MAJOR PORTION OF A SPHERE, (E) SAID PISTON MEMBER BEING PROVIDED WITH MEANS CLOSING THE LOWER END OF SAID RECESS, AND (F) SAID MEANS BEING SPACED FROM SAID CENTRAL PORTION OF SAID TOP MEMBER.
Claim 2
Dependent Claim
133 words
IN AN INTERNAL COMBUSTION ENGINE A PISTON ASSEMBLY COMPRISING, (A) A PISTON MEMBER HAVING AN UPPER PLANAR SURFACE HAVING A CENTRAL OPENING AND A SUBSTANTIALLY CYLINDRICAL RECESS PROVIDED IN SAID PISTON MEMBER IN REGISTRY WITH SAID OPENING AND DEFINED BY AN INNER SUBSTANTIALLY ANNULAR SURFACE, (B) A TOP MEMBER EXTENDING ENTIRELY ACROSS SAID UPPER PLANAR SURFACE AND HAVING A LOWER SURFACE SECURED TO SAID UPPER SURFACE, (C) SAID TOP MEMBER HAVING A CENTRAL PORTION DEFINING A COMBUSTION CHAMBER CAVITY AND EXTENDING THROUGH SAID OPENING AND INTO SAID RECESS, (D) SAID COMBUSTION CHAMBER CAVITY BEING IN THE FORM OF THE MAJOR PORTION OF A SPHERE, (E) SAID PISTON MEMBER BEING PROVIDED WITH MEANS CLOSING THE LOWER END OF SAID RECESS, AND (F) SAID MEANS BEING SPACED FROM SAID CENTRAL PORTION OF SAID TOP MEMBER.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |