Patent US3539169A successfully refreshed from Google Patents.
US3539169A
Expired / Lapsed
US
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Melting furnaces
Assignee: Gas Council
•
Filing: 1968-02-13
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Granted: 1970-11-10
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Expires: 1988-02-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur Higgs
- 👤 Harry Lashley
- 👤 George Roland Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:03
CPC Classifications
F; F27; F27B; F27B19/00; F27B14/00; F27B3/00; F27B3/04; F27B3/045; F27B3/10; F27B3/12; F27B3/16; F27B7/00; F27B7/20; F27B7/2083; F27B3/24; F27D; F27D3/00; F27D3/04; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 0
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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) | 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 |