US3368520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-vacuum indicator
Assignee: Dynamic Research Corp
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Filing: 1964-06-25
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Granted: 1968-02-13
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Expires: 1984-06-25
Abstract
No abstract record available.
Inventors
- 👤 Man Heiko T De
- 👤 James A Beaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:17
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; G; G01; G01L; G01L7/00; G01L7/02; G01L7/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A GAUGE FOR INDICATING THE DIRECTION OF GAS FLOW WITH RESPECT TO THE VENTILATION OF A CRANKCASE IN AN AUTOMOBILE ENGINE, COMPRISING: A HOUSING DEFINING AN ENCLOSED CHANNEL AND HAVING OPPOSED LIGHT-TRANSMISSIVE WALL PORTIONS DEFINING AN INDICATING ZONE ALONG THE CHANNEL; ILLUMINATING MEANS ARRANGED TO SELECTIVELY PROJECT A BEAM OF LIGHT THROUGH SAID INDICATING ZONE; SAID HOUSING HAVING VAPOR ADMITTING APERTURES ADJACENT EACH END OF SAID CHANNEL; AND FIRST AND SECOND LIGHT-CONDUCTIVE INDICATOR MEANS DISPOSED IN SAID CHANNEL INTERMEDIATE SAID APERTURES, SAID INDICATOR MEANS BEING MOVABLE TO A FIRST POSITION IN RESPONSE TO A POSITIVE PRESSURE CONDITION WITHIN SAID CHANNEL WHEREIN SAID FIRST LIGHT-CONDUCTIVE INDICATOR MEANS IS DISPOSED IN THE PATH OF SAID LIGHT BEAM, AND TO A SECOND POSITION IN RESPONSE TO A NEGATIVE PRESSURE WITHIN SAID CHANNEL WHEREIN SAID SECOND LIGHT-CONDUCTIVE INDICATOR MEANS IS DISPOSED IN THE PATH OF SAID LIGHT BEAM, SAID PRESSURE CONDITIONS BEING ATTRIBUTABLE TO THE DIRECTION OF VAPOR PASSAGE THROUGH SAID VAPOR APERTURES.
Claim 2
Dependent Claim
159 words
A GAUGE FOR INDICATING THE DIRECTION OF GAS FLOW WITH RESPECT TO THE VENTILATION OF A CRANKCASE IN AN AUTOMOBILE ENGINE, COMPRISING: A HOUSING DEFINING AN ENCLOSED CHANNEL AND HAVING OPPOSED LIGHT-TRANSMISSIVE WALL PORTIONS DEFINING AN INDICATING ZONE ALONG THE CHANNEL; ILLUMINATING MEANS ARRANGED TO SELECTIVELY PROJECT A BEAM OF LIGHT THROUGH SAID INDICATING ZONE; SAID HOUSING HAVING VAPOR ADMITTING APERTURES ADJACENT EACH END OF SAID CHANNEL; AND FIRST AND SECOND LIGHT-CONDUCTIVE INDICATOR MEANS DISPOSED IN SAID CHANNEL INTERMEDIATE SAID APERTURES, SAID INDICATOR MEANS BEING MOVABLE TO A FIRST POSITION IN RESPONSE TO A POSITIVE PRESSURE CONDITION WITHIN SAID CHANNEL WHEREIN SAID FIRST LIGHT-CONDUCTIVE INDICATOR MEANS IS DISPOSED IN THE PATH OF SAID LIGHT BEAM, AND TO A SECOND POSITION IN RESPONSE TO A NEGATIVE PRESSURE WITHIN SAID CHANNEL WHEREIN SAID SECOND LIGHT-CONDUCTIVE INDICATOR MEANS IS DISPOSED IN THE PATH OF SAID LIGHT BEAM, SAID PRESSURE CONDITIONS BEING ATTRIBUTABLE TO THE DIRECTION OF VAPOR PASSAGE THROUGH SAID VAPOR APERTURES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |