US3398342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic burner height control circuit
Assignee: Hancock and Co Engineers Ltd
•
Filing: 1965-11-12
•
Granted: 1968-08-20
•
Expires: 1985-11-12
Abstract
No abstract record available.
Inventors
- 👤 Derek H Redman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:02
CPC Classifications
B; B23; B23K; B23K7/00; B23K7/10; B23K7/102; G; G05; G05D; G05D5/00; G05D5/04; G05D5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2364645A
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US2534958A
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US2747152A
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FR1150016A
Cited
US2949391A
Cited
US3024354A
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US3225281A
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US3286127A
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US3290032A
Cited
US3217204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |