US2204447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Houdry Process Corp
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Filing: 1938-07-16
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Granted: 1940-06-11
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Expires: 1958-07-16
Abstract
No abstract record available.
Inventors
- 👤 Samans Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:33
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0066; F28D7/0083; F28D7/0091; B; B01; B01J; B01J8/00; B01J8/02; B01J8/0242; B01J8/025; B01J8/04; B01J8/0446; B01J8/0476; B01J8/048; F28D13/00; F28D7/16; F28F; F28F9/00; F28F9/22; F28F9/26; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00132; B01J2208/02; B01J2208/021; B01J2219/00; B01J2219/00002; B01J2219/00018; B01J2219/0002
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) | 1943-06-11 | 1943-12-11 | 1944-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-11 | 1947-12-11 | 1948-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-11 | 1951-12-11 | 1952-06-11 | $7700.00 | Window Closed / Lapsed |