Patent US2980104A successfully refreshed from Google Patents.
US2980104A
Expired / Lapsed
US
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Radiant heaters
Assignee: Hupp Corp
•
Filing: 1958-01-22
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Granted: 1961-04-18
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Expires: 1978-01-22
Abstract
No abstract record available.
Inventors
- 👤 Malcolm W Patrick
- 👤 William M Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:58
CPC Classifications
F; F23; F23C; F23C99/00; F23C2700/00; F23C2700/04; F23C2700/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US436656A
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US935886A
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US1547316A
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US2009271A
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FR771705A
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US2193176A
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US2410881A
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US2604935A
Cited
US2728384A
Cited
US2771132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |