US3662470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dipstick assembly
Assignee: Power Parts Co
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Filing: 1970-09-02
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Granted: 1972-05-16
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Expires: 1990-09-02
Abstract
Abstract An oil level dipstick assembly provides a check valve that effects an air seal when the dipstick is removed, but which valve is open when the dipstick is in place to permit the stick to reliably measure the oil level in an oil reservoir for an apparatus having moving parts therein, even when the apparatus is in operation.
Inventors
- 👤 Peter J Sasgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/04; F; F01; F01M; F01M11/00; F01M11/10; F01M11/12; F16; F16N; F16N19/00; F16N19/003
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
In an oil level dipstick assembly that includes an elongated measuring rod the lower portion of which is adapted for communication with oil and which bears indicia for enabling an operator to ascertain the oil level, the improvement comprising, in combination, an elongated sleeve for receiving thereinto the elongated measuring rod, a valve for the lower end of the sleeve, means at the upper ends of the rod and sleeve for sealing the sleeve when the rod is positioned to measure the oil level, the rod and sleeve being of selected lengths such that when the rod is positioned to measure the oil level the rod unseats the valve from the lower end of the sleeve, a retainer housing connected to and surrounding the lower portion of the sleeve and the valve, the housing being normally spring biased to urge the valve toward seating position against the sleeve, and aperture means permitting oil to enter past the retainer housing to the interior of the sleeve.
Claim 2
Dependent Claim
165 words
In an oil level dipstick assembly that includes an elongated measuring rod the lower portion of which is adapted for communication with oil and which bears indicia for enabling an operator to ascertain the oil level, the improvement comprising, in combination, an elongated sleeve for receiving thereinto the elongated measuring rod, a valve for the lower end of the sleeve, means at the upper ends of the rod and sleeve for sealing the sleeve when the rod is positioned to measure the oil level, the rod and sleeve being of selected lengths such that when the rod is positioned to measure the oil level the rod unseats the valve from the lower end of the sleeve, a retainer housing connected to and surrounding the lower portion of the sleeve and the valve, the housing being normally spring biased to urge the valve toward seating position against the sleeve, and aperture means permitting oil to enter past the retainer housing to the interior of the sleeve.
Claim 3
Dependent Claim
30 words
In an improved oil level dipstick assembly as described in claim 1, the elongated rod being threaded adjacent its upper end for engagement with a threaded portion of the sleeve.
Claim 4
Dependent Claim
35 words
In an improved oil level dipstick assembly as described in claim 1, the elongated rod carrying an encircling ring above the indicia to inhibit contact of the rod with the inner wall of the sleeve.
Claim 5
Dependent Claim
22 words
In an improved oil level dipstick as described in claim 1, the sleeve being provided with a bleed aperture intermediate its ends.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |