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US2467133A
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High-frequency electric field heating to produce uniform welds in a stack of organicthermoplastic films
Assignee: Dow Chemical Co
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Filing: 1946-08-31
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Granted: 1949-04-12
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Expires: 1966-08-31
Abstract
No abstract record available.
Inventors
- 👤 Carroll R Irons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:33
CPC Classifications
B; B32; B32B; B32B27/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2087480A
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US2109323A
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US2232640A
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US2232062A
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US2259239A
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US2307344A
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US2352520A
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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) | 1952-04-11 | 1952-10-11 | 1953-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-11 | 1956-10-11 | 1957-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-11 | 1960-10-11 | 1961-04-12 | $7700.00 | Window Closed / Lapsed |