US3790286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black testing by analyzing non-specularly reflected polarized light
Assignee: Phillips Petroleum Co
•
Filing: 1972-04-21
•
Granted: 1974-02-05
•
Expires: 1992-04-21
Abstract
Abstract A dry reflectance test is carried out with incident light polarized in the plane of reflection and an analyzer is inserted into the remitted beam, crossed with respect to the incident radiation.
Inventors
- 👤 G Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:48
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A carbon black surface area measuring method which comprises passing an incident beam of light through a first polarizer onto the surface of carbon black to be measured, and passing a nonspecular beam of radiation reflected from the surface through a second polarizer to a detector, said first polarizer being set to transmit light polarized in the plane of reflection and said second polarizer being set to pass light polarized at an angle of 90* with relatioN respect to said first polarizer, the detected radiation being a function of the surface area of the carbon black.
Claim 2
Dependent Claim
96 words
A carbon black surface area measuring method which comprises passing an incident beam of light through a first polarizer onto the surface of carbon black to be measured, and passing a nonspecular beam of radiation reflected from the surface through a second polarizer to a detector, said first polarizer being set to transmit light polarized in the plane of reflection and said second polarizer being set to pass light polarized at an angle of 90* with relatioN respect to said first polarizer, the detected radiation being a function of the surface area of the carbon black.
References Cited (Backward Citations)
US2947212A
Cited
US3594085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |