US3923949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a such-back-preventing check valve in a liquid dispenser
Assignee: Individual
•
Filing: 1974-10-15
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Granted: 1975-12-02
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Expires: 1994-10-15
Abstract
Abstract A method for providing an integral check valve of the flap valve type in the discharge spout of a telescopically movable head of a liquid dispenser molded or formed of an elastomeric plastic material such as polypropylene or polyethelene.
Inventors
- 👤 Neil G Kane
- 👤 Administrator By Virginia Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:57
CPC Classifications
B; B05; B05B; B05B11/00; B05B11/0005; B05B11/0062; B05B11/007; B29; B29C; B29C33/00; B29C33/0033; B29C33/44; B29C33/48; B29C33/485; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/10; B29K2023/12; B29L; B29L2031/00; B29L2031/748; B29L2031/7506
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
220 words
THE METHOD OF MOLDING A CHECK VALVE IN THE FORM OF A FLAP TO CONTROL LIQUID FLOW BETWEEN A CHAMBER IN THE MANUALLY TELESCOPICALLY MOVABLE HEAD OF A LIQUID DISPENSER THAT CONSISTS IN THE STEPS OF: MOLDING SAID HEAD OF AN ELASTOMERIC PLASTIC TO PROVIDE THE SAME WITH CONCENTRIC COAXIAL WALLS THAT DEFINE SAID CHAMBER, SIMULTANEOUSLY MOLDING A LATERALLY DIRECTED SPOUT AROUND A CORE PIN TO FORM A FLOW PASSAGE WITHIN SAID SPOUT, WITH SAID SPOUT EXTENDING FROM SAID COAXIAL CHAMBER WALLS AND THE PASSAGE BEING OPEN TO THE UPPER END OF SAID CHAMBER, THE END OF THE CORE PIN BEING FORMED TO SIMULTANEOUSLY MOLD A BRIDGE PORTION OF SAID ELASTOMERIC MATERIAL, THE BRIDGE PORTION EXTENDING OUTWARDLY FROM THE INNER OF SAID COAXIAL WALLS ON AN UPWARD AND FORWARD ANGLE, TRANSVERSELY ACROSS THE PASSAGE, AND INTERGRALLY UNITD WITH THE SIDE WALLS OF THE SPOUT, AND FINALLY WITHDRAWING THE CORE PIN FROM THE PASSAGE TO CAUSE VERTICAL RELATIVE MOVEMENT BETWEEN THE BRIDGE PORTION AND THE END OF THE CORE PIN WHICH CAUSE THE END THEREOF TO SHEAR THE OPPOSITE ENDS OF THE BRIDGE PORTION FORM THE SIDE WALLS OF THE SPOUT TO CONVERT SAID BRIDGE PORTION INTO A FLAP SO THE SAME IS FREE TO FLAP UP AND DOWN ACCORDING TO CHANGES IN PRESSURE IN SAID CHAMBER AND SAID FLOW PASSAGE.
Claim 2
Independent Claim
220 words
THE METHOD OF MOLDING A CHECK VALVE IN THE FORM OF A FLAP TO CONTROL LIQUID FLOW BETWEEN A CHAMBER IN THE MANUALLY TELESCOPICALLY MOVABLE HEAD OF A LIQUID DISPENSER THAT CONSISTS IN THE STEPS OF: MOLDING SAID HEAD OF AN ELASTOMERIC PLASTIC TO PROVIDE THE SAME WITH CONCENTRIC COAXIAL WALLS THAT DEFINE SAID CHAMBER, SIMULTANEOUSLY MOLDING A LATERALLY DIRECTED SPOUT AROUND A CORE PIN TO FORM A FLOW PASSAGE WITHIN SAID SPOUT, WITH SAID SPOUT EXTENDING FROM SAID COAXIAL CHAMBER WALLS AND THE PASSAGE BEING OPEN TO THE UPPER END OF SAID CHAMBER, THE END OF THE CORE PIN BEING FORMED TO SIMULTANEOUSLY MOLD A BRIDGE PORTION OF SAID ELASTOMERIC MATERIAL, THE BRIDGE PORTION EXTENDING OUTWARDLY FROM THE INNER OF SAID COAXIAL WALLS ON AN UPWARD AND FORWARD ANGLE, TRANSVERSELY ACROSS THE PASSAGE, AND INTERGRALLY UNITD WITH THE SIDE WALLS OF THE SPOUT, AND FINALLY WITHDRAWING THE CORE PIN FROM THE PASSAGE TO CAUSE VERTICAL RELATIVE MOVEMENT BETWEEN THE BRIDGE PORTION AND THE END OF THE CORE PIN WHICH CAUSE THE END THEREOF TO SHEAR THE OPPOSITE ENDS OF THE BRIDGE PORTION FORM THE SIDE WALLS OF THE SPOUT TO CONVERT SAID BRIDGE PORTION INTO A FLAP SO THE SAME IS FREE TO FLAP UP AND DOWN ACCORDING TO CHANGES IN PRESSURE IN SAID CHAMBER AND SAID FLOW PASSAGE.
Claim 3
Dependent Claim
60 words
The method according to claim 1 in which the mentioned shearing of the bridge portion is carried out by the faces of a biased slot in the end of the core pin, the rear edge of the slot progressively effecting such shear of the flap from the side walls of the flow passage as the core pin is being withdrawn.
References Cited (Backward Citations)
US3064310A
Cited
US3776676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |