US2688532A
Expired / Lapsed
US
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Method of determining carbon content of organic finishing material
Assignee: AT&T Inc
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Filing: 1951-11-02
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Granted: 1954-09-07
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Expires: 1971-11-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Harris R Till
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:43
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/12; G01N33/00; G01N33/26; G01N33/32; Y; Y10; Y10S; Y10S436/00; Y10S436/908; Y10T; Y10T436/00; Y10T436/23
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
THE METHOD OF DETERMINING THE FREE CARBON CONTENT OF ORGANIC FINISHING MATERIALS INCLUDING AN ORGANIC VEHICLE, FREE CARBON AND NONOXIDIZABLE INORGANIC PIGMENTS, WHICH COMPRISES HEATING A SAMPLE OF SUCH A PAINT OF KNOWN WEIGHT TO A TEMPERATURE OF ABOUT 500* C. IN AN ATMOSPHERE OF NITROGEN, WHEREBY THE ORGANIC VEHICLE IS VOLATILIZED AND THE CARBON IN THE RESIDUE IS NOT OXIDIZED, WEIGHING THE RESIDUE, FIRING THE RESIDUE IN THE PRESENCE OF OXYGEN TO OXIDIZE THE CARBON AND VOLATILIZE IT, AND WEIGHING THE RESIDUE OF INORGANIC PIGMENT.
References Cited (Backward Citations)
US1743035A
Cited
US2224044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |