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Patent US2220777A successfully refreshed from Google Patents.
US2220777A
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Valveless chemical heater
Assignee: Individual
•
Filing: 1939-02-01
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Granted: 1940-11-05
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Expires: 1959-02-01
Abstract
No abstract record available.
Inventors
- 👤 Donald F Othmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:27
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/02; A61F7/03; A47; A47J; A47J36/00; A47J36/24; A47J36/2411; A47J36/28; B; B01; B01D; B01D9/00; B01D9/005; C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; F; F28; F28D; F28D20/00; F28D20/02; F28D20/028; A61F2007/0292; A61F2007/0293; Y; Y02; Y02E; Y02E60/00; Y02E60/14
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) | 1943-11-05 | 1944-05-06 | 1944-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-05 | 1948-05-06 | 1948-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-05 | 1952-05-06 | 1952-11-05 | $7700.00 | Window Closed / Lapsed |