US2853284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High velocity heater
Assignee: John E Mitchell Co
•
Filing: 1954-06-10
•
Granted: 1958-09-23
•
Expires: 1974-06-10
Abstract
No abstract record available.
Inventors
- 👤 Jr William P Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
F; F26; F26B; F26B21/00; F26B21/001; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0488; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1510636A
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US1781263A
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US1874488A
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US2395666A
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US2508792A
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US2553091A
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US2658308A
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US2627307A
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US2673726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |