US3572947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring uniformity of sheet material by light transmission
Assignee: Anglo Paper Products Ltd
•
Filing: 1968-11-29
•
Granted: 1971-03-30
•
Expires: 1988-11-29
Abstract
Abstract The sheet to be tested for uniformity is moved past a lighttransmitting element having a surface in engagement with one side of the sheet. Light is applied to the opposite side of the sheet over a surface area at least as great as the area of the element surface and in opposed relation thereto. The light transmitted by the element is sensed to determine the average intensity and magnitude of variation thereof.
Inventors
- 👤 Ola Sepall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:42
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
Apparatus for measuring uniformity of a moving sheet of material which comprises: a. an open-ended tubular member; b. a light source at one end of said tubular member for directing a beam of light therethrough; c. an opaque member overlying the other end of said tubular member; d. means urging said members towards each other for engagement therebetween of said sheet of material and confinement of said light beam; e. a light-conducting element having a cross-sectional area less than that of said other end of said tubular member and extending through said opaque member in axial alignment with said tubular member; f. a light-sensing cell fixed to said opaque member in direct contact with and completely overlying said light conducting element; and g. means for measuring the electrical output signal of said cell.
Claim 2
Dependent Claim
133 words
Apparatus for measuring uniformity of a moving sheet of material which comprises: a. an open-ended tubular member; b. a light source at one end of said tubular member for directing a beam of light therethrough; c. an opaque member overlying the other end of said tubular member; d. means urging said members towards each other for engagement therebetween of said sheet of material and confinement of said light beam; e. a light-conducting element having a cross-sectional area less than that of said other end of said tubular member and extending through said opaque member in axial alignment with said tubular member; f. a light-sensing cell fixed to said opaque member in direct contact with and completely overlying said light conducting element; and g. means for measuring the electrical output signal of said cell.
Claim 3
Dependent Claim
33 words
Apparatus for measuring uniformity of a moving sheet of material as defined in claim 1, said means urging said members towards each other comprising a spring upon which said tubular member is seated.
Claim 4
Dependent Claim
27 words
Apparatus for measuring uniformity of a moving sheet of material as defined in claim 1, said light conducting element being a transparent rod of uniform cross section.
Claim 5
Dependent Claim
47 words
Apparatus for measuring uniformity of a moving sheet of material as defined in claim 1, said light sensing cell being a silicon solar cell. 5 Apparatus for measuring uniformity of a moving sheet of material as defined in claim 1, said light-sensing cell being a selenium cell.
References Cited (Backward Citations)
US3114791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |