US2713259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing the hardness of materials
Assignee: Individual
•
Filing: 1949-12-21
•
Granted: 1955-07-19
•
Expires: 1969-12-21
Abstract
No abstract record available.
Inventors
- 👤 Grodzinski Paul
- 👤 Beard Frederick Arthur
- 👤 Stern Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:05
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1763400A
Cited
US1770046A
Cited
US1830842A
Cited
US2109521A
Cited
US2088371A
Cited
US2188992A
Cited
US2182235A
Cited
US2422634A
Cited
US2285200A
Cited
US2289874A
Cited
GB568327A
Cited
US2472927A
Cited
US2436435A
Cited
US2491667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-18 | 1959-01-17 | 1959-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-18 | 1963-01-17 | 1963-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-18 | 1967-01-17 | 1967-07-19 | $7700.00 | Window Closed / Lapsed |