Patent US2937402A successfully refreshed from Google Patents.
US2937402A
Expired / Lapsed
US
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Apparatus for producing film
Assignee: Union Carbide Corp
•
Filing: 1956-01-06
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Granted: 1960-05-24
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Expires: 1976-01-06
Abstract
No abstract record available.
Inventors
- 👤 Russell F Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:44
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/03; B29C48/09; B29C48/10; B29C48/001; B29C48/0018; B29C48/0019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1657132A
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US2161908A
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US1845249A
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US1993349A
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US2345086A
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US2433937A
Cited
US2676356A
Cited
US2714744A
Cited
US2703434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |