Patent US3472601A successfully refreshed from Google Patents.
US3472601A
Expired / Lapsed
US
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Radiant gas burner element
Assignee: Sango Toki KK
•
Filing: 1967-12-12
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Granted: 1969-10-14
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Expires: 1987-12-12
Abstract
No abstract record available.
Inventors
- 👤 Masami Yamamura
- 👤 Kazuo Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:44
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/12; F23D14/151; F23D14/14; F23D14/149; F23D2212/00; F23D2212/10; F23D2212/103; F23D2212/20; F23D2212/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1388238A
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US1707976A
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US3087041A
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US3173470A
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US3179156A
Cited
US3216478A
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US3291188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |