Patent US3763892A successfully refreshed from Google Patents.
Patent US3017575A successfully refreshed from Google Patents.
US3017575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic recording apparatus
Assignee: Vyzkumny A Zkusebni Letecky Ustav AS
•
Filing: 1959-03-04
•
Granted: 1962-01-16
•
Expires: 1979-03-04
Abstract
No abstract record available.
Inventors
- 👤 Dubsky Borivoj
- 👤 Bican Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:52
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/12; G01L1/127; G01L1/125; Y; Y10; Y10S; Y10S73/00; Y10S73/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1572949A
Cited
US1707286A
Cited
GB442441A
Cited
US2511178A
Cited
US2469005A
Cited
US2579629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |