Patent US2501690A successfully refreshed from Google Patents.
US2501690A
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Method and apparatus for making multiple layer plastic conduits
Assignee: CARTER PRODUCTS Corp
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Filing: 1947-12-09
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Granted: 1950-03-28
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Expires: 1967-12-09
Abstract
No abstract record available.
Inventors
- 👤 Walter S Prendergast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:24
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/127; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/16; B29C48/18; B29C48/21; B29C48/03; B29C48/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US253822A
Cited
US876755A
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US1679545A
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US1802605A
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US1978163A
Cited
DE658102C
Cited
GB495144A
Cited
US2401551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |