US2569809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating method and apparatus
Assignee: Individual
•
Filing: 1948-05-03
•
Granted: 1951-10-02
•
Expires: 1968-05-03
Abstract
No abstract record available.
Inventors
- 👤 Frank M Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:23
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2218793A
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US1439340A
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US1671677A
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US2135742A
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US2130089A
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US2100867A
Cited
US2313390A
Cited
US2414339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |