US2879499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency pen recorder
Assignee: Individual
•
Filing: 1954-07-23
•
Granted: 1959-03-24
•
Expires: 1974-07-23
Abstract
No abstract record available.
Inventors
- 👤 Ackerlind Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:14
CPC Classifications
G; G01; G01D; G01D9/00; G01D9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1555281A
Cited
US2006961A
Cited
US2286072A
Cited
US2306435A
Cited
US2364210A
Cited
US2406353A
Cited
US2714202A
Cited
US2546829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |