US2803515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording apparatus
Assignee: Clevite Corp
•
Filing: 1954-01-05
•
Granted: 1957-08-20
•
Expires: 1974-01-05
Abstract
No abstract record available.
Inventors
- 👤 Begun Semi Joseph
- 👤 Everett R Sarratt
- 👤 John F Blaha
- 👤 Dean R Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:54
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/02; G11B33/06; G01; G01V; G01V1/00; G01V1/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2370133A
Cited
US2573748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |