Patent US3837660A successfully refreshed from Google Patents.
US3837660A
Expired / Lapsed
US
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Composite seal ring
Assignee: MONGUL SUPERTEX SpA
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Filing: 1972-04-24
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Granted: 1974-09-24
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Expires: 1992-04-24
Abstract
Abstract Seal rings for rotating shafts are manufactured by locating or causing to be supplied in a mould having the shape of the complete ring two materials having a chemical affinity and suitable the one to embody the outer rigid part and the other to embody the inner flexible part of the ring, and by effecting the polymerization of said materials. The seal ring thus obtained consists of a single piece of synthetic material, rigid in its outer part and flexible in the internal part corresponding to the seal lip.
Inventors
- 👤 M Poggio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:23
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0053; F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/328; F16J15/3284; B29K; B29K2021/00; B29L; B29L2031/00; B29L2031/26; Y; Y10; Y10S; Y10S277/00; Y10S277/922; Y10S277/935; Y10S277/936; Y10S277/937; Y10S277/944
Claims Analysis
Total Claims: 0
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |