Patent US2786504A successfully refreshed from Google Patents.
US2786504A
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Screen changing apparatus for conduits and tubes for conveying fluids and for extrusion machines
Assignee: NAT PLASTIC PRODUCTS Co
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Filing: 1953-10-20
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Granted: 1957-03-26
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Expires: 1973-10-20
Abstract
No abstract record available.
Inventors
- 👤 Lee F Samler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:44
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/24; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/256; B29C48/36; B29C48/50; B29C48/69; B29C48/691; B29C48/6912; Y; Y10; Y10T; Y10T137/00; Y10T137/794; Y10T137/8049
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) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |