Patent US2831950A successfully refreshed from Google Patents.
US2831950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant heater unit
Assignee: Individual
•
Filing: 1954-06-10
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Granted: 1958-04-22
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Expires: 1974-06-10
Abstract
No abstract record available.
Inventors
- 👤 Lefebvre Fredrick Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:40
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/44; H05B3/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US558167A
Cited
US581170A
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US712749A
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US1032267A
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US1359400A
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US1494938A
Cited
US1543695A
Cited
US2063642A
Cited
US2114888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |