Patent US3539865A successfully refreshed from Google Patents.
US3539865A
Expired / Lapsed
US
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Crowbar protection device
Assignee: ROBAND ELECTRONICS Ltd
•
Filing: 1969-05-15
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Granted: 1970-11-10
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Expires: 1989-05-15
Abstract
No abstract record available.
Inventors
- 👤 Keith Hugh Billings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:11
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/041; H02H9/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3192441A
Cited
US3371262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |