US4254403B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for transmitting information in an alternating current electricity supply system
Assignee: ABB Metering Systems Ltd
•
Filing: 1979-08-06
•
Granted: 1994-05-31
•
Expires: 1999-08-06
Abstract
No abstract record available.
Inventors
- 👤 Leonardo Perez-Cavero
- 👤 Michael W A Cross
- 👤 Geoffrey Fielding
- 👤 Frederick M Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/542; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1313; H02J13/1315; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/542; H04B2203/5462; H04B2203/5495; Y; Y04; Y04S; Y04S10/00; Y04S10/50; Y04S10/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |