Patent US1915352A successfully refreshed from Google Patents.
US1915352A
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Heat interchanger and process of making the same
Assignee: Girdler Corp
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Filing: 1931-10-30
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Granted: 1933-06-27
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Expires: 1951-10-30
Abstract
No abstract record available.
Inventors
- 👤 Bottoms Robert Roger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:38
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0041; B; B21; B21D; B21D53/00; B21D53/02; B21D53/027; F28D7/02; F28D7/024; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/414; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49362
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) | 1936-06-26 | 1936-12-26 | 1937-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-26 | 1940-12-26 | 1941-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-26 | 1944-12-26 | 1945-06-27 | $7700.00 | Window Closed / Lapsed |