US3521087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current limiting circuit
Assignee: Spacelabs Medical Inc
•
Filing: 1969-05-16
•
Granted: 1970-07-21
•
Expires: 1989-05-16
Abstract
No abstract record available.
Inventors
- 👤 Carl A Lombardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:25
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/02; H02H9/025; H03; H03G; H03G11/00; H03K; H03K5/00; H03K5/01; H03K5/08; Y; Y10; Y10S; Y10S128/00; Y10S128/908
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2073428A
Cited
US2922945A
Cited
US3024422A
Cited
US3174093A
Cited
US3195533A
Cited
US3303413A
Cited
US3320947A
Cited
US3412266A
Cited
US3369129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |