Patent US2199031A successfully refreshed from Google Patents.
US2199031A
Expired / Lapsed
US
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Heat exchange apparatus
Assignee: Excel Auto Radiator Co
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Filing: 1938-03-21
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Granted: 1940-04-30
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Expires: 1958-03-21
Abstract
No abstract record available.
Inventors
- 👤 Philmore F Sperry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:57
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024; B; B60; B60H; B60H1/00; B60H1/00457; B60H1/00464
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) | 1943-04-30 | 1943-10-30 | 1944-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-30 | 1947-10-30 | 1948-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-30 | 1951-10-30 | 1952-04-30 | $7700.00 | Window Closed / Lapsed |