US3446689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of plastic pipes
Assignee: Shell USA Inc
•
Filing: 1964-12-09
•
Granted: 1969-05-27
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Frederik W Storm Van Leeuwen
- 👤 Jan C Van Dijk
- 👤 Johan C Hoogeveen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:57
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C31/00; B29C31/002; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C53/607; B29C53/80; B29C53/82; B29C53/821; B29C53/822; B29C63/00; B29C63/24; B29C69/00; B29C69/001; B29C69/002; B29C70/16; B29K; B29K2309/00; B29K2309/08; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US587545A
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US1913327A
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US3068134A
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US3049762A
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US3234309A
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US3159183A
Cited
US3216876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |