Patent US4147931A successfully refreshed from Google Patents.
US4147931A
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Procedure for measuring unit area weights
Assignee: Individual
•
Filing: 1977-10-27
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Granted: 1979-04-03
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Expires: 1997-10-27
Abstract
Abstract A procedure for measuring unit area weights (base weights) in materials combinations comprising a base material, thereupon a precoating, and upon which latter there is a surface coating or coatings. The materials combination is irradiated with x-rays which excite the characteristic x-ray radiation of a substance in the precoat, the intensity of which is measured above and below the coated base material, in addition to which the absorption in the materials combination of the primary radiation from the radiation source is measured, whereby from the mutually independent results of measurement obtained the unit area weights of the different courses are calculated.
Inventors
- 👤 Pertti Puumalainen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:19
CPC Classifications
G; G01; G01B; G01B15/00; G01B15/02; G01N; G01N23/00; G01N23/22; G01N23/223; G01N2223/00; G01N2223/07; G01N2223/076
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
106 words
Improvement in a procedure for measuring unit area weights in material combinations having a base material, thereupon a precoat and upon which latter there is a surfacing coat or coats, wherein the improvement comprises that the materials combination is irradiated with x-rays which excite the characteristic x-ray radiation of a substance in the precoat, the intensity of which is measured above and below the coated base material, in addition to which the absorption in the materials combination of the primary radiation from the radiation source is measure whereby from the mutually independent results of measurement obtained the unit area weights of the different courses are calculated.
Claim 2
Dependent Claim
106 words
Improvement in a procedure for measuring unit area weights in material combinations having a base material, thereupon a precoat and upon which latter there is a surfacing coat or coats, wherein the improvement comprises that the materials combination is irradiated with x-rays which excite the characteristic x-ray radiation of a substance in the precoat, the intensity of which is measured above and below the coated base material, in addition to which the absorption in the materials combination of the primary radiation from the radiation source is measure whereby from the mutually independent results of measurement obtained the unit area weights of the different courses are calculated.
Claim 3
Dependent Claim
29 words
Procedure according to claim 1, characterized in that the materials combination is cardboard or paper overlayed with a CaCO 3 precoat and upon this latter as surface coating, caolin.
References Cited (Backward Citations)
US2977478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |