Patent US1663944A successfully refreshed from Google Patents.
US1663944A
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US
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Method for preventing scorification of fire bars, grate surfaces, and the like
Assignee: FIRM METALLISATOR BERLIN AKTIE
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Filing: 1925-01-29
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Granted: 1928-03-27
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Expires: 1945-01-29
Abstract
No abstract record available.
Inventors
- 👤 Hopfelt Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
F; F23; F23H; F23H13/00; F23H2700/00; F23H2700/001; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12167; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
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) | 1931-03-27 | 1931-09-26 | 1932-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-03-27 | 1935-09-26 | 1936-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-03-27 | 1939-09-26 | 1940-03-27 | $7700.00 | Window Closed / Lapsed |