US2349439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contrivance for the heating of gases
Assignee: Beazer East Inc
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Filing: 1939-12-27
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Granted: 1944-05-23
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Expires: 1959-12-27
Abstract
No abstract record available.
Inventors
- 👤 Koppers Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/22; B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/2425; C01B3/32; C01B3/34; C01B3/38; C01B3/384; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00081; B01J2219/0015; B01J2219/00155; B01J2219/00159
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-05-23 | 1947-11-22 | 1948-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-05-23 | 1951-11-22 | 1952-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-05-23 | 1955-11-22 | 1956-05-23 | $7700.00 | Window Closed / Lapsed |