Patent US2689379A successfully refreshed from Google Patents.
US2689379A
Expired / Lapsed
US
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Method of producing riddled thermoplastic sheets
Assignee: Union Carbide Corp
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Filing: 1951-04-25
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Granted: 1954-09-21
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Expires: 1971-04-25
Abstract
No abstract record available.
Inventors
- 👤 Nissel Frank Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:16
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/02; B29C59/06; B26; B26F; B26F1/00; B26F1/02; B26F1/06; B29C70/00; B29C70/58; Y; Y10; Y10S; Y10S264/00; Y10S264/70
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |