Patent JPS5228338A successfully refreshed from Google Patents.
US3500722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnetic transducer
Assignee: FRANK E OBERMAIER
•
Filing: 1968-12-16
•
Granted: 1970-03-17
•
Expires: 1988-12-16
Abstract
No abstract record available.
Inventors
- 👤 Rudolph L Franz
- 👤 Frank E Obermaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/10; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2093; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7783; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87209
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2915045A
Cited
US2964051A
Cited
US3094132A
Cited
US3073345A
Cited
US3155104A
Cited
US3334642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |