Patent US1641999A successfully refreshed from Google Patents.
US1641999A
Expired / Lapsed
US
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Heat-transfer device
Assignee: Babcock and Wilcox Co
•
Filing: 1925-07-09
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Granted: 1927-09-13
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Expires: 1945-07-09
Abstract
No abstract record available.
Inventors
- 👤 Webster Hosea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:13
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/22; F28F2009/222; F28F2009/224; F28F2009/226; Y; Y10; Y10S; Y10S122/00; Y10S122/01; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/413
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) | 1930-09-12 | 1931-03-14 | 1931-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-09-12 | 1935-03-14 | 1935-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-09-12 | 1939-03-14 | 1939-09-13 | $7700.00 | Window Closed / Lapsed |