US4484469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminosity probe with positively retained light pipe
Assignee: Snap On Inc
•
Filing: 1983-05-09
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Granted: 1984-11-27
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Expires: 2003-05-09
Abstract
Abstract The luminosity probe includes an elongated tubular member having a bore extending therethrough. Within the bore is a light pipe having a diameter less than the diameter of the bore so as to create an annulus therebetween. Such annulus is filled with epoxy.
Inventors
- 👤 Donald D. Grover
- 👤 Ralph H. Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:03
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/06; F02P7/073; F02B; F02B77/00; F02B77/08; F02B77/087
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A luminosity probe for diesel-engine timing apparatus comprising an elongated tubular member adapted to be mounted in the opening of a selected engine cylinder and having a tip projecting into the combustion zone thereof to be subjected to light occurring therein, said tubular member having a portion projecting outside the cylinder, said tubular member having a bore therein, a light pipe in the bore having an outside diameter less than the inside diameter of the bore so as to create an annulus therebetween, said light pipe having a retaining portion of diameter different than substantially the rest of said light pipe, binder means in said annulus, a coupler telescopically engaging said projecting portion, and a photodetector within said coupler in effective relation with the adjacent end of said light pipe for converting light passing through said light pipe into electrical signals.
Claim 2
Dependent Claim
141 words
A luminosity probe for diesel-engine timing apparatus comprising an elongated tubular member adapted to be mounted in the opening of a selected engine cylinder and having a tip projecting into the combustion zone thereof to be subjected to light occurring therein, said tubular member having a portion projecting outside the cylinder, said tubular member having a bore therein, a light pipe in the bore having an outside diameter less than the inside diameter of the bore so as to create an annulus therebetween, said light pipe having a retaining portion of diameter different than substantially the rest of said light pipe, binder means in said annulus, a coupler telescopically engaging said projecting portion, and a photodetector within said coupler in effective relation with the adjacent end of said light pipe for converting light passing through said light pipe into electrical signals.
Claim 3
Dependent Claim
30 words
The luminosity probe of claim 1, wherein said light pipe has a substantially constant diameter for the entire length thereof except for said retaining portion which has a smaller diameter.
Claim 4
Dependent Claim
30 words
The luminosity probe of claim 1, wherein said light pipe has a substantially constant diameter for the entire length thereof except for said retaining portion which has a larger diameter.
Claim 5
Dependent Claim
15 words
The luminosity probe of claim 1, wherein said light pipe has only one retaining portion.
Claim 6
Dependent Claim
23 words
The luminosity probe of claim 1, wherein said light pipe has no abrupt changes in diameter in the region of said retaining portion.
Claim 7
Dependent Claim
21 words
The luminosity probe of claim 1, wherein said projecting portion is a male element and said coupler is a female element.
Claim 8
Dependent Claim
18 words
The luminosity probe of claim 1, wherein said retaining portion is at one end of said light pipe.
References Cited (Backward Citations)
US4337648A
Cited
US4409815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |