Patent US1785159A successfully refreshed from Google Patents.
US1785159A
Expired / Lapsed
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Heat-interchange device
Assignee: Individual
•
Filing: 1927-09-14
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Granted: 1930-12-16
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Expires: 1947-09-14
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Ullman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:59
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/024; F24; F24D; F24D3/00; F24D3/08; F24D3/087; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F9/00; F28F9/22; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/406
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) | 1933-12-15 | 1934-06-16 | 1934-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-15 | 1938-06-16 | 1938-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-15 | 1942-06-16 | 1942-12-16 | $7700.00 | Window Closed / Lapsed |