US3104676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse core check valve
Assignee: Millennium Petrochemicals Inc
•
Filing: 1958-08-14
•
Granted: 1963-09-24
•
Expires: 1978-08-14
Abstract
No abstract record available.
Inventors
- 👤 Donald E Steer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:24
CPC Classifications
F; F16; F16K; F16K15/00; F16K11/00; F16K11/10; F16K11/105; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/3786; Y10T137/7504; Y10T137/7613; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7932; Y10T137/7933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A VALVE CORE ADAPTED TO BE MOUNTED IN A HOUSING, SAID CORE COMPRISING A HOLLOW BARREL FORMED WITH AN INTERIOR CIRCULAR SEAT, AN ATTACHMENT PLUG FORMED WITH AN EXTERNAL SCREW THREAD, SAID PLUG BEING ATTACHED TO THE REARWARD END OF SAID BARREL BY MEANS OF A SWIVEL JOINT, A SPRING PRESSED CENTER PIN MOUNTED IN SAID BARREL FOR SLIDING MOVEMENT THEREIN, SAID PIN BEING FORMED WITH A FORWARDLY PROJECTING OPERATING END AND WITH A SEALING ELEMENT INTERMEDIATE ITS LENGTH ENGAGEABLE WITH SAID INTERIOR SEAT UNDER THE INFLUENCE OF SAID SPRING AND WITH A GUIDING EXTENSION ON SAID BARREL, SURROUNDING AND GUIDING THE FORWARDLY PROJECTING END OF SAID PIN, SAID GUIDING EXTENSION BEING ATTACHED TO SAID BARREL BY MEANS OF A SKELETON CONSTRUCTION, PERMITTING PASSAGE OF FLUID FROM THE INTERIOR OF SAID BARREL TO A POINT BEYOND SAID GUIDE WITHOUT PASSING THROUGH SAID GUIDE.
Claim 2
Dependent Claim
143 words
A VALVE CORE ADAPTED TO BE MOUNTED IN A HOUSING, SAID CORE COMPRISING A HOLLOW BARREL FORMED WITH AN INTERIOR CIRCULAR SEAT, AN ATTACHMENT PLUG FORMED WITH AN EXTERNAL SCREW THREAD, SAID PLUG BEING ATTACHED TO THE REARWARD END OF SAID BARREL BY MEANS OF A SWIVEL JOINT, A SPRING PRESSED CENTER PIN MOUNTED IN SAID BARREL FOR SLIDING MOVEMENT THEREIN, SAID PIN BEING FORMED WITH A FORWARDLY PROJECTING OPERATING END AND WITH A SEALING ELEMENT INTERMEDIATE ITS LENGTH ENGAGEABLE WITH SAID INTERIOR SEAT UNDER THE INFLUENCE OF SAID SPRING AND WITH A GUIDING EXTENSION ON SAID BARREL, SURROUNDING AND GUIDING THE FORWARDLY PROJECTING END OF SAID PIN, SAID GUIDING EXTENSION BEING ATTACHED TO SAID BARREL BY MEANS OF A SKELETON CONSTRUCTION, PERMITTING PASSAGE OF FLUID FROM THE INTERIOR OF SAID BARREL TO A POINT BEYOND SAID GUIDE WITHOUT PASSING THROUGH SAID GUIDE.
References Cited (Backward Citations)
US1187154A
Cited
FR475736A
Cited
US1561367A
Cited
FR728273A
Cited
US2048843A
Cited
US2236585A
Cited
GB651963A
Cited
US2443851A
Cited
US2660834A
Cited
FR1069397A
Cited
US2758608A
Cited
US2886055A
Cited
US2862515A
Cited
US2949928A
Cited
US2923318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |