US2962218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air heating system
Assignee: Individual
•
Filing: 1957-07-15
•
Granted: 1960-11-29
•
Expires: 1977-07-15
Abstract
No abstract record available.
Inventors
- 👤 Dibert Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:35
CPC Classifications
F; F24; F24D; F24D5/00; F24D5/02; F24D5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2243503A
Cited
US1733759A
Cited
US1675384A
Cited
US2198136A
Cited
US2560246A
Cited
US2658504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |