Patent US3027890A successfully refreshed from Google Patents.
US3027890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air heater
Assignee: Individual
•
Filing: 1958-06-25
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Granted: 1962-04-03
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Expires: 1978-06-25
Abstract
No abstract record available.
Inventors
- 👤 Evan C Siggelkow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:41
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US218982A
Cited
US378871A
Cited
US1403146A
Cited
US1447142A
Cited
US1727714A
Cited
US2017621A
Cited
US2799267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |