Patent US2838084A successfully refreshed from Google Patents.
US2838084A
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Screen changing method for conduits and tubes for conveying fluids and for extrusionmachines
Assignee: NAT PLASTIC PRODUCTS Co
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Filing: 1956-08-08
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Granted: 1958-06-10
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Expires: 1976-08-08
Abstract
No abstract record available.
Inventors
- 👤 Lee F Samler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:55
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/12; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/254; B29C48/256; B29C48/27; B29C48/2725; B29C48/36; B29C48/50; B29C48/69; B29C48/691; B29C48/6912; B29C48/6914; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0441
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |