US2579507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warm-air heating system utilizing as the fuel a combustible gas
Assignee: JET HEET Inc
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Filing: 1949-09-13
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Granted: 1951-12-25
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Expires: 1969-09-13
Abstract
No abstract record available.
Inventors
- 👤 Calvin D Maccracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:01
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065; F24D; F24D5/00; F24D5/02; Y; Y10; Y10S; Y10S236/00; Y10S236/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |