US2674981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat generator
Assignee: Vapor Heating Corp
•
Filing: 1948-04-28
•
Granted: 1954-04-13
•
Expires: 1968-04-28
Abstract
No abstract record available.
Inventors
- 👤 Clarkson Alick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:44
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/0005; F24H9/001; F24H9/0026; F23; F23D; F23D11/00; F23D11/36; F23D11/46; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US641992A
Cited
US1032532A
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US1516430A
Cited
US1734310A
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US1640317A
Cited
US1986914A
Cited
US2040959A
Cited
US2325964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |