Patent US3306573A successfully refreshed from Google Patents.
US3306573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced seat for butterfly valve
Assignee: Crane Co
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Filing: 1964-03-20
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Granted: 1967-02-28
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Expires: 1984-03-20
Abstract
No abstract record available.
Inventors
- 👤 Trefil James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:18
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263; F16K1/2265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A REINFORCING METALLIC RETAINING RING FOR A BUTTERFLY VALVE SEAT OR THE LIKE, THE COMBINATION OF AN ANNULAR ELASTOMER SEAT, THE SAID RING BEING OF SUBSTANTIALLY SEMICIRCULAR CONFIGURATION IN CROSS-SECTION, AN INNER ANNULAR PORTION OF THE SAID SEAT RECEIVING SAID RING, THE LATTER BEING FORMED WITH AN INNER ANNULAR ROUNDED CORNER PORTION AND WITH AN OUTER ANNULAR SHARP CORNER PORTION WHEREBY TO ENABLE SAID RING TO IMBED ITSELF WITHIN THE PORTED PORTION OF THE SAID SEAT UPON PREDETERMINED MOVEMENT OF SAID RING INWARDLY RELATIVE TO THE SAID SEAT.
Claim 2
Dependent Claim
88 words
A REINFORCING METALLIC RETAINING RING FOR A BUTTERFLY VALVE SEAT OR THE LIKE, THE COMBINATION OF AN ANNULAR ELASTOMER SEAT, THE SAID RING BEING OF SUBSTANTIALLY SEMICIRCULAR CONFIGURATION IN CROSS-SECTION, AN INNER ANNULAR PORTION OF THE SAID SEAT RECEIVING SAID RING, THE LATTER BEING FORMED WITH AN INNER ANNULAR ROUNDED CORNER PORTION AND WITH AN OUTER ANNULAR SHARP CORNER PORTION WHEREBY TO ENABLE SAID RING TO IMBED ITSELF WITHIN THE PORTED PORTION OF THE SAID SEAT UPON PREDETERMINED MOVEMENT OF SAID RING INWARDLY RELATIVE TO THE SAID SEAT.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |