US3020752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attachment devices for hardness testing instruments
Assignee: PENETRASCOPE Ltd
•
Filing: 1957-11-08
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Granted: 1962-02-13
•
Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
- 👤 Pocknee James Kitchener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:06
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42; Y; Y10; Y10T; Y10T408/00; Y10T408/05; Y10T408/21; Y10T408/55; Y10T408/564
Claims Analysis
Total Claims: 0
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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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |