US3594906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent liquid level indicator
Assignee: Individual
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Filing: 1970-02-27
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Granted: 1971-07-27
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Expires: 1990-02-27
Abstract
Abstract A transparent liquid level indicator in which a transparent casing is disposed within the tank or reservoir and is provided with a movable plunger. Biasing means normally maintain the plunger in its uppermost position, and when the handle is depressed, the plunger is provided with a piston on the lower end thereof which is depressed or moved downwardly in the casing below an oil or liquid inlet port. The liquid within the tank then enters the casing, and the handle is released so that the biasing means causes the handle to move back to its normal uppermost position and to trap the liquid within the transparent casing. The liquid that is then held or trapped within the transparent casing indicates the level of the liquid in the reservoir when the casing is removed from the reservoir.
Inventors
- 👤 William H Kerfoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:35
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
322 words
An indicator and sampling device comprising an elongated transparent plastic casing open at the top, said casing having a thin wall lower cylindrical portion and an upper thick walled cylindrical portion, said upper cylindrical portion being of substantially larger diameter than said lower portion, said lower portion having an outwardly flared portion adjacent its upper end, forming an annular shoulder therearound, said upper portion having an annular flange adjacent its lower end in verticalspaced relationship with said annular shoulder, a collarlike resilient tubular ring having a normal elliptical configuration disposed in the space between said flange and shoulder, a threaded plastic cap member secured to said casing and having a central opening therein, said casing having vertical spaced oil inlet and oil outlet ports in the lower end of said lower cylindrical portion, a plunger member having an enlarged cylindrical section disposed in said casing comprising a shaft with a crimp therein, a ball guide secured on said crimp, a slidable resilient piston having conical tapered end portions secured to the lower tip of said shaft to seal against the inner surface of said lower cylindrical section, the upper end of said shaft disposed in said upper thick-walled cylindrical section, a reduced cylindrical plunger section disposed below said enlarged cylindrical section, a spring member disposed around said reduced cylindrical section and seated on an inwardly projecting portion of said annular flange and bearing against the lower end of said enlarged cylindrical section to normally force it upwardly, another reduced cylindrical finger grip section disposed above said enlarged section and extending through said central opening and curved back upon itself to form a loop for gripping the device, air vent means in the lower sides of said thick-walled cylindrical portion, said piston being disposed above the uppermost oil inlet ports when said spring member maintains said enlarged section in its uppermost position and below said oil inlet ports when said spring is depressed.
Claim 2
Dependent Claim
322 words
An indicator and sampling device comprising an elongated transparent plastic casing open at the top, said casing having a thin wall lower cylindrical portion and an upper thick walled cylindrical portion, said upper cylindrical portion being of substantially larger diameter than said lower portion, said lower portion having an outwardly flared portion adjacent its upper end, forming an annular shoulder therearound, said upper portion having an annular flange adjacent its lower end in verticalspaced relationship with said annular shoulder, a collarlike resilient tubular ring having a normal elliptical configuration disposed in the space between said flange and shoulder, a threaded plastic cap member secured to said casing and having a central opening therein, said casing having vertical spaced oil inlet and oil outlet ports in the lower end of said lower cylindrical portion, a plunger member having an enlarged cylindrical section disposed in said casing comprising a shaft with a crimp therein, a ball guide secured on said crimp, a slidable resilient piston having conical tapered end portions secured to the lower tip of said shaft to seal against the inner surface of said lower cylindrical section, the upper end of said shaft disposed in said upper thick-walled cylindrical section, a reduced cylindrical plunger section disposed below said enlarged cylindrical section, a spring member disposed around said reduced cylindrical section and seated on an inwardly projecting portion of said annular flange and bearing against the lower end of said enlarged cylindrical section to normally force it upwardly, another reduced cylindrical finger grip section disposed above said enlarged section and extending through said central opening and curved back upon itself to form a loop for gripping the device, air vent means in the lower sides of said thick-walled cylindrical portion, said piston being disposed above the uppermost oil inlet ports when said spring member maintains said enlarged section in its uppermost position and below said oil inlet ports when said spring is depressed.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |