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Patent US3504474A successfully refreshed from Google Patents.
US3504474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stacked radial winding
Assignee: DYK PRESTRESSED TANKS Inc
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Filing: 1968-04-02
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Granted: 1970-04-07
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Expires: 1988-04-02
Abstract
No abstract record available.
Inventors
- 👤 Maximiliaan J Dykmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:47
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; E04G2021/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1781699A
Cited
US2803868A
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US2869214A
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US2887130A
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US3143306A
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US3110503A
Cited
US3241278A
Cited
US3355357A
Cited
US3404497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |