US2500501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat exchangers
Assignee: MW Kellogg Co
•
Filing: 1946-09-12
•
Granted: 1950-03-14
•
Expires: 1966-09-12
Abstract
No abstract record available.
Inventors
- 👤 Paul R Trumpler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; B; B21; B21D; B21D53/00; B21D53/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49393
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US83019A
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US145907A
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US299972A
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US790979A
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US1559180A
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US2196186A
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US2154217A
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US2247199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |