US3488517A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control systems
Assignee: Merseyside and North Wales Electricity Board
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Filing: 1967-06-26
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Granted: 1970-01-06
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Expires: 1987-06-26
Abstract
No abstract record available.
Inventors
- 👤 James Macmillan Cowan
- 👤 Frederic Edwin Brooker
- 👤 Brian Nield
- 👤 William James Stuart Rogers
- 👤 Edmund Smith
- 👤 Frank Tarpey
- 👤 John Durnford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:49
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1315; H02J13/1313; H02J13/18; H02J13/333; Y; Y02; Y02B; Y02B90/00; Y02B90/20; Y02E; Y02E60/00; Y04; Y04S; Y04S10/00; Y04S10/50; Y04S10/52; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |