US3276509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame protector for gas burners
Assignee: Interstate Engineering Corp
•
Filing: 1964-03-30
•
Granted: 1966-10-04
•
Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Allan B Fredhold
- 👤 Robert E Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:57
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/72; F23D14/725
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US601426A
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US1949026A
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US1397160A
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US2225203A
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US2220247A
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US2372953A
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US2518329A
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FR1047738A
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US2855034A
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US3056450A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |