Patent US1962170A successfully refreshed from Google Patents.
US1962170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger construction
Assignee: CF Braun and Co
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Filing: 1933-07-10
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Granted: 1934-06-12
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Expires: 1953-07-10
Abstract
No abstract record available.
Inventors
- 👤 Lawrence I Blennerhassett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:32
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/163; F28D7/1638; F28D7/1646; F28F; F28F9/00; F28F9/02; F28F9/0229; F28F9/0236; F28F9/0239
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) | 1937-06-11 | 1937-12-11 | 1938-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-11 | 1941-12-11 | 1942-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-11 | 1945-12-11 | 1946-06-12 | $7700.00 | Window Closed / Lapsed |