Patent US3291444A successfully refreshed from Google Patents.
US3291444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valves
Assignee: David F Wiseman and Sons Ltd
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Filing: 1964-02-21
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Granted: 1966-12-13
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Expires: 1984-02-21
Abstract
No abstract record available.
Inventors
- 👤 Willis Harold Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:50
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/52; F16K31/521; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A BUTTERFLY VALVE COMPRISING A VALVE BODY FORMED BY TWO CO-AXIALLY APERTURED MEMBERS HAVING A PAIR OF ABUTTING DIAMETRAL FACES, A CLOSURE-MEMBER SUPPORTED BY A SPINDLE LOCATED ON EACH SIDE OF THE CLOSURE MEMBER IN A PAIR OF COMPLEMENTARY CHANNELS IN SAID DIAMETRAL FACES WITH THE CLOSURE MEMBER FREE FOR ROTATION IN A FLOW PASSAGE DEFINED BY THE APERTURES IN SAID MEMBERS, A SEATING RING MOUNTED IN A CONTINUOUS RECESS DEFINED BETWEEN SAID DIAMETRAL FACES AND SURROUNDING SAID FLOW PASSAGE IN THE OFFSET RELATION TO SAID CHANNELS IN THE DIRECTION OF THE AXIS OF SAID FLOW PASSAGE, SAID RING SERVING TO PROVIDE A RESILIENT MOUTH FOR SEALING ENGAGEMENT WITH THE PERIPHERY OF SAID CLOSURE MEMBER, AND MEANS FOR FASTENING TOGETHER SAID TWO MEMBERS.
Claim 2
Dependent Claim
123 words
A BUTTERFLY VALVE COMPRISING A VALVE BODY FORMED BY TWO CO-AXIALLY APERTURED MEMBERS HAVING A PAIR OF ABUTTING DIAMETRAL FACES, A CLOSURE-MEMBER SUPPORTED BY A SPINDLE LOCATED ON EACH SIDE OF THE CLOSURE MEMBER IN A PAIR OF COMPLEMENTARY CHANNELS IN SAID DIAMETRAL FACES WITH THE CLOSURE MEMBER FREE FOR ROTATION IN A FLOW PASSAGE DEFINED BY THE APERTURES IN SAID MEMBERS, A SEATING RING MOUNTED IN A CONTINUOUS RECESS DEFINED BETWEEN SAID DIAMETRAL FACES AND SURROUNDING SAID FLOW PASSAGE IN THE OFFSET RELATION TO SAID CHANNELS IN THE DIRECTION OF THE AXIS OF SAID FLOW PASSAGE, SAID RING SERVING TO PROVIDE A RESILIENT MOUTH FOR SEALING ENGAGEMENT WITH THE PERIPHERY OF SAID CLOSURE MEMBER, AND MEANS FOR FASTENING TOGETHER SAID TWO MEMBERS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |