US2759248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat transfer units
Assignee: Individual
•
Filing: 1951-03-23
•
Granted: 1956-08-21
•
Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Russell H Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:37
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49389; Y10T29/49789; Y10T29/49826; Y10T29/49893; Y10T29/49904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1382420A
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US1598062A
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US1671351A
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US1402849A
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US1554493A
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US1623064A
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US1767005A
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US2163591A
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US2431228A
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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) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |