US2918219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid heating systems
Assignee: JET HEET Inc
•
Filing: 1956-02-09
•
Granted: 1959-12-22
•
Expires: 1976-02-09
Abstract
No abstract record available.
Inventors
- 👤 Calvin D Maccracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:42
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/02; F04; F04B; F04B43/00; F04B43/08; F04B43/10; F22; F22D; F22D7/00; F24H; F24H3/00; F24H3/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US809164A
Cited
US862867A
Cited
US1189806A
Cited
DE343964C
Cited
GB287267A
Cited
US2212281A
Cited
US2688923A
Cited
US2744470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |