Patent US3680790A successfully refreshed from Google Patents.
US3680790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dipper tube sprayer
Assignee: Societe Technique de Pulverisation SA STEP
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Filing: 1971-03-24
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Granted: 1972-08-01
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Expires: 1991-03-24
Abstract
Abstract A sprayer wherein the dipper tube dipping into a liquid-carrying container is connected with a tube ending with a spraying nozzle through a sleeve-shaped piston controlled by the depression of last mentioned tube. The valve closing normally the passage through the piston is urged away by said depression of the tube against the action of a spring and its novelty resides in the provision of a thin peripheral lip provided in said valve and frictionally engaging the inner surface of the chamber so as to produce transiently a compression in said chamber when the valve is shifted by the sliding tube, after which the compressed liquid passes past the deformed lip towards the nozzle.
Inventors
- 👤 Michel Boris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:15
CPC Classifications
B; B05; B05B; B05B11/00; B05B11/0005; B05B11/0062; B05B11/007; B05B11/01; B05B11/10; B05B11/1001; B05B11/1023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
In a sprayer including a compression chamber, a dipper tube forming an extension of said chamber, a sleeve-shaped piston slidingly fitted in said chamber and provided with an annular seat facing the chamber, a tube slidingly adapted to engage the end of the piston opposed to the seat to urge said piston towards the dipper tube, a spraying nozzle at the end of the tube opposed to the piston and hand-operable means adapted to urge the tube downwardly into engagement with the piston, the combination of a flap valve adapted to engage the seat on the piston to close the passage through the latter and to be urged away from said seat by the sliding tube before the latter engages the piston end, said valve being provided with a thin peripheral lip frictionally engaging the inner surface of the chamber and elastic means fitted inside the chamber and urging the flap valve against its seat thereby to shift the piston away from the dipper tube.
Claim 2
Dependent Claim
165 words
In a sprayer including a compression chamber, a dipper tube forming an extension of said chamber, a sleeve-shaped piston slidingly fitted in said chamber and provided with an annular seat facing the chamber, a tube slidingly adapted to engage the end of the piston opposed to the seat to urge said piston towards the dipper tube, a spraying nozzle at the end of the tube opposed to the piston and hand-operable means adapted to urge the tube downwardly into engagement with the piston, the combination of a flap valve adapted to engage the seat on the piston to close the passage through the latter and to be urged away from said seat by the sliding tube before the latter engages the piston end, said valve being provided with a thin peripheral lip frictionally engaging the inner surface of the chamber and elastic means fitted inside the chamber and urging the flap valve against its seat thereby to shift the piston away from the dipper tube.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |