US2554901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond indenter for testing the hardness of metals
Assignee: Individual
•
Filing: 1946-05-23
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Granted: 1951-05-29
•
Expires: 1966-05-23
Abstract
No abstract record available.
Inventors
- 👤 Fromholt Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:25
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A DIAMOND INDENTER FOR TESTING THE HARDNESS OF METALS, THE OPERATIVE PART OF WHICH COMPRISES A DIAMOND CUT TO THE FORM OF A REGULAR POLYGONAL PYRAMID OF COMPARATIVELY SMALL APEX ANGLE AND THE APEX OF WHICH IS TRUNCATED, AND A SMALLER REGULAR POLYGONAL PYRAMID WITH A LARGER APEX ANGLE, THE BASE OF WHICH MATCHES THE TRUNCATION OF THE FIRST PYRAMID, THE AXES OF THE TWO PYRAMIDS COINCIDING AND LYING PERPENDICULARLY TO THE PLANE OF TRUNCATION OF THE FIRST PYRAMID.
Claim 2
Dependent Claim
79 words
A DIAMOND INDENTER FOR TESTING THE HARDNESS OF METALS, THE OPERATIVE PART OF WHICH COMPRISES A DIAMOND CUT TO THE FORM OF A REGULAR POLYGONAL PYRAMID OF COMPARATIVELY SMALL APEX ANGLE AND THE APEX OF WHICH IS TRUNCATED, AND A SMALLER REGULAR POLYGONAL PYRAMID WITH A LARGER APEX ANGLE, THE BASE OF WHICH MATCHES THE TRUNCATION OF THE FIRST PYRAMID, THE AXES OF THE TWO PYRAMIDS COINCIDING AND LYING PERPENDICULARLY TO THE PLANE OF TRUNCATION OF THE FIRST PYRAMID.
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) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |