Patent US2695628A successfully refreshed from Google Patents.
US2695628A
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Check valve
Assignee: Saint Gobain Abrasives Inc
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Filing: 1950-10-19
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Granted: 1954-11-30
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Expires: 1970-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jr William M Wheildon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:51
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/048; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A CHECK VALVE CONSISTING OF AN ALUMINA BALL AND A SEAT MADE OF 90% BY VOLUME BORIDE SELECTED FROM THE GROUP CONSISTING OF CB4, TIB2, VB2, CRB2, ZRB2, CBB2, MO2B5, HFB2, TAB2 AND W2B5, AND MIXTURES THEREOF, AT LEAST 40% BY VOLUME OF THE COMPOSITION BEING CARBON BORIDE CB4 AND NOT OVER 50% OF THE COMPOSITION BY VOLUME BEING METAL BORIDE AND 97% BY VOLUME OF THE COMPOSITION BEING BORIDE SELECTED FROM SAID GROUP AND UNCOMBINED BORON AND CARBON IN SOLID SOLUTION.
Claim 2
Dependent Claim
82 words
A CHECK VALVE CONSISTING OF AN ALUMINA BALL AND A SEAT MADE OF 90% BY VOLUME BORIDE SELECTED FROM THE GROUP CONSISTING OF CB4, TIB2, VB2, CRB2, ZRB2, CBB2, MO2B5, HFB2, TAB2 AND W2B5, AND MIXTURES THEREOF, AT LEAST 40% BY VOLUME OF THE COMPOSITION BEING CARBON BORIDE CB4 AND NOT OVER 50% OF THE COMPOSITION BY VOLUME BEING METAL BORIDE AND 97% BY VOLUME OF THE COMPOSITION BEING BORIDE SELECTED FROM SAID GROUP AND UNCOMBINED BORON AND CARBON IN SOLID SOLUTION.
References Cited (Backward Citations)
US2311228A
Cited
US1435029A
Cited
US1617603A
Cited
US1897214A
Cited
US2061480A
Cited
US2530274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |