Patent US2697248A successfully refreshed from Google Patents.
US2697248A
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Film stretching device
Assignee: Dow Chemical Co
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Filing: 1952-12-22
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Granted: 1954-12-21
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Expires: 1972-12-22
Abstract
No abstract record available.
Inventors
- 👤 Murrey O Longstreth
- 👤 Daniel W Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:03
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/28; B29C55/285; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C2793/00; B29C2793/0063; B29C2793/009; B29C48/001; B29C48/0018; B29C48/0019; B29C48/0022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB431619A
Cited
US2361369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |