US3358770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementing valve for oil well casing
Assignee: Zanal Corporation of Alberta Ltd
•
Filing: 1965-04-16
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Granted: 1967-12-19
•
Expires: 1985-04-16
Abstract
No abstract record available.
Inventors
- 👤 Zandmer Solis Myron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:27
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/146; E21B34/00; E21B34/06; E21B34/063; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7934; Y10T137/7937
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A CEMENTING VALVE FOR USE IN A WELL CEMENTING OPERATION, COMPRISING: A HOLLOW VALVE BODY HAVING A FLOW PASSAGE EXTENDING THROUGH SAID BODY TO THE EXTERIOR OF SAID BODY; CHECK VALVE MEANS MOUNTED IN ONE END OF SAID PASSAGE WHICH UNSEATS IN A DIRECTION TO PERMIT OUTWARD FLOW THROUGH SAID PASSAGE; AND A SHEAR VALVE MEANS FIXED IN THE OTHER END OF SAID PASSAGE INCLUDING A DISC SLIDABLY RECEIVED IN SAID BODY AND CLOSING SAID PASSAGE AND ADAPTED TO BE EXPELLED OUTWADLY FROM SAID PASSAGE IN RESPONSE TO A PREDETERMINED PRESSURE WITHIN SAID PASSAGE ON THE INNER SURFACE OF SAID SHEAR VALVE MEANS; SAID SHEAR VALVE MEANS INCLUDING AN ARCUATE SHEAR MEMBER ENGAGING SAID DISC AT THE CIRCUMFERENCE THEREOF AND THE SURROUNDING VALVE BODY TO RESIST IN SHEAR OUTWARD MOVEMENT OF THE DISC, THE SHEAR RESISTANCE BEING PROPORTIONAL TO THE CIRCUMFERENTIAL LENGTH OF THE ARCUATE SHEAR MEMBER.
Claim 2
Dependent Claim
147 words
A CEMENTING VALVE FOR USE IN A WELL CEMENTING OPERATION, COMPRISING: A HOLLOW VALVE BODY HAVING A FLOW PASSAGE EXTENDING THROUGH SAID BODY TO THE EXTERIOR OF SAID BODY; CHECK VALVE MEANS MOUNTED IN ONE END OF SAID PASSAGE WHICH UNSEATS IN A DIRECTION TO PERMIT OUTWARD FLOW THROUGH SAID PASSAGE; AND A SHEAR VALVE MEANS FIXED IN THE OTHER END OF SAID PASSAGE INCLUDING A DISC SLIDABLY RECEIVED IN SAID BODY AND CLOSING SAID PASSAGE AND ADAPTED TO BE EXPELLED OUTWADLY FROM SAID PASSAGE IN RESPONSE TO A PREDETERMINED PRESSURE WITHIN SAID PASSAGE ON THE INNER SURFACE OF SAID SHEAR VALVE MEANS; SAID SHEAR VALVE MEANS INCLUDING AN ARCUATE SHEAR MEMBER ENGAGING SAID DISC AT THE CIRCUMFERENCE THEREOF AND THE SURROUNDING VALVE BODY TO RESIST IN SHEAR OUTWARD MOVEMENT OF THE DISC, THE SHEAR RESISTANCE BEING PROPORTIONAL TO THE CIRCUMFERENTIAL LENGTH OF THE ARCUATE SHEAR MEMBER.
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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) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |