US2581133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphic recorder with sliding coils
Assignee: SOUND APPARATUS Co
•
Filing: 1950-11-02
•
Granted: 1952-01-01
•
Expires: 1970-11-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Niemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/04; G01R13/08; G01D; G01D15/00; G01D15/24; H; H02; H02K; H02K41/00; H02K41/02; H02K41/035
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1320291A
Cited
US1740456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |