US2731878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
sherwin
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
•
Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:32
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/14; G01N15/1468; G01N33/00; G01N33/20; G01N33/202; G01N33/2028
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A METHOD OF DETERMINING THE METALLOGRAPHIC CONSTITUENT CONTENT OF A METAL SPECIMEN WHICH COMPRISES PRODUCING AN ILLUMINATED REPRODUCTION OF AN ETCHED SURFACE OF THE SPECIMEN, ELECTRICALLY SCANNING THE INTENSITY OF ILLUMINATION FROM EACH POINT OF SAID REPRODUCTION ALONG A LINE EXTENDING TRANSVERSELY THEREOF TO PRODUCE ELECTRICAL INTELLIGENCE IN THE FORM OF AN ELECTRIC FORCE VARYING WITH THE INTENSITY OF ILLUMINATION ALONG SAID LINE, AND RECORDING THE VARIATIONS IN SAID ELECTRIC FORCE TO PROVIDE A RECORD OF MICROCONSTITUENTS OF SAID SPECIMEN.
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) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |