US3619578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating surface depressions in a material
Assignee: Canadian Patents and Development Ltd
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Filing: 1969-09-22
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Granted: 1971-11-09
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Expires: 1989-09-22
Abstract
Abstract An apparatus for indicating the surface depression, for example, softwood veneer, wherein light from a microscope illuminator is directed between a straightedge and a surface of the veneer passing in sliding contact underneath the straightedge, a silicon diode detects light reflected above a predetermined intensity from underneath the straightedge as an indication that the depth of the depression is above a minimum, and an electronic counter counts the number of such depressions per unit length of veneer. A marker attached to the counter applies a black mark to the veneer whenever a predetermined number of such depressions is exceeded per unit length, and a further marker may be used to mark the veneer with a red dot at each unit length.
Inventors
- 👤 Paul George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/898
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
Apparatus for indicating grain surface depressions in a material comprising a straightedge, means slidably mounting said straightedge in an upward direction for maintaining sliding contact between said straightedge and a portion of the surface of said material, with said straightedge extending across said surface depressions, a light source disposed to one side of said straightedge, for directing a beam of light along the grain and between the contacting surfaces of said straightedge and said material, a light intensity detecting device disposed on the other side of said straightedge for detecting any light reflected from said light source underneath said straightedge along a depression, and indicating means connected to said detecting device for indicating only the number of times said reflected light is thereby detected when a predetermined minimum number of times is exceeded per unit length of said material, when said reflected light is above a predetermined intensity, as an indication of the number of depressions having a greater depth than a predetermined minimum.
Claim 2
Dependent Claim
164 words
Apparatus for indicating grain surface depressions in a material comprising a straightedge, means slidably mounting said straightedge in an upward direction for maintaining sliding contact between said straightedge and a portion of the surface of said material, with said straightedge extending across said surface depressions, a light source disposed to one side of said straightedge, for directing a beam of light along the grain and between the contacting surfaces of said straightedge and said material, a light intensity detecting device disposed on the other side of said straightedge for detecting any light reflected from said light source underneath said straightedge along a depression, and indicating means connected to said detecting device for indicating only the number of times said reflected light is thereby detected when a predetermined minimum number of times is exceeded per unit length of said material, when said reflected light is above a predetermined intensity, as an indication of the number of depressions having a greater depth than a predetermined minimum.
Claim 3
Dependent Claim
33 words
Apparatus according to claim 1, wherein marking means is provided for marking said fibrous material at positions where said minimum number of times reflected light is detected by said detecting device is exceeded.
Claim 4
Dependent Claim
55 words
Apparatus according to claim 1, wherein marking means is provided for marking said fibrous material at said unit lengths, and said indicating means includes a marking means for marking said fibrous material between said unit length markings at positions where said minimum number of times reflected light is detected by said detecting device is exceeded.
Claim 5
Dependent Claim
90 words
Apparatus according to claim 1, wherein said detecting device is a glass tube encapsulated silicon diode, and indicating means has a DC amplifier for amplifying the output of said silicon diode, a pulse shaper and discriminator for indicating the output signals of said pulse shaper and discriminator when they are above a predetermined value, an electronic counter for counting the outputs from said pulse shaper and discriminator, and a spotter and counter control for receiving the output of said electronic counter and actuating said marking means of said detecting device.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |