US3493777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No break electrical changeover
Assignee: International Standard Electric Corp
•
Filing: 1968-10-17
•
Granted: 1970-02-03
•
Expires: 1988-10-17
Abstract
No abstract record available.
Inventors
- 👤 Brian William Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:29
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/735; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061; H03K17/73; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y04; Y04S; Y04S20/00; Y04S20/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3135872A
Cited
US3360661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |