Patent US2448433A successfully refreshed from Google Patents.
US2448433A
Expired / Lapsed
US
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Making wrinkle-free film
Assignee: Dow Chemical Co
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Filing: 1945-09-10
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Granted: 1948-08-31
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Expires: 1965-09-10
Abstract
No abstract record available.
Inventors
- 👤 Carroll R Irons
- 👤 Charles E Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:43
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/023; B29B13/024; B29C; B29C53/00; B29C53/02; B29C53/10; B29C55/00; B29C55/28; B29K; B29K2027/00; B29K2027/06; B29K2995/00; B29K2995/0037; B29K2995/0041; B29K2995/005; B29K2995/0053; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |