US2986379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1957-06-04
•
Granted: 1961-05-30
•
Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Kramig Anna Louise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:17
CPC Classifications
F; F28; F28C; F28C1/00; F28C1/02; B; B01; B01J; B01J19/00; B01J19/32; F28F; F28F25/00; F28F25/02; F28F25/08; F28F25/087; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32203; B01J2219/32206; B01J2219/3221; B01J2219/32213; B01J2219/32224; B01J2219/32227; B01J2219/324; B01J2219/32425; B01J2219/32458; F28F2245/00; F28F2245/08; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2104060A
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GB550561A
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US2434466A
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US2609314A
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US2661197A
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US2793017A
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US2809818A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |