US3587155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring manufacture,productive of line contact seal
Assignee: Navistar International Corp
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Filing: 1968-09-06
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Granted: 1971-06-28
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Expires: 1988-09-06
Abstract
Abstract METHODS, APPARATUS, AND IMPROVED STRUCTURE HAVING AS THEIR COMMON BASIS THE SEQUENCE OF COLLAPSING A PISTON RING IN A FIXTURE APPROXIMATING ENGINE BORE DIAMETER, AND LAPPING A LOCALITY AT THE SIDE OF THE RING WHILE SO COLLAPSED, UNTIL A CIRCUMFERENTIALLY CONTINUOUS PORTION-NARROW IN WIDTH AND PREFERABLY LINE SIZE-OF THE SIDE IS FLAT IN THE RNGE OF AT LEAST ABOUT 10 TO 5 LIGHT BANDS. THE BROADEST METHOD DISCLOSED IS THE USE EXCLUSIVELY OF RINGS SO SELECTED THAT THE INNER PERIPHERAL EDGE AT THE SIDE HAS ALL POINTS THEREON IN COPLANARILITY TO A DEGREE EQUIVALENT TO THE STATED RANGE TO SEAL IN ABSOLUTE LINE CONTACT.
Inventors
- 👤 Norman M Packard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:41
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/08; B24B19/11; F; F16; F16J; F16J9/00; F16J9/02; F16J9/12; F16J9/20; Y; Y10; Y10S; Y10S277/00; Y10S277/924; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274; Y10T29/49282
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |