Patent US3474756A successfully refreshed from Google Patents.
US3474756A
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US
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Filament impregnating device
Assignee: Shell USA Inc
•
Filing: 1966-09-12
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Granted: 1969-10-28
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Expires: 1986-09-12
Abstract
No abstract record available.
Inventors
- 👤 Jan C Van Dijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:51
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/18; C03C25/16; D; D06; D06B; D06B3/00; D06B3/04; D06B3/045; D06B3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1560575A
Cited
US2135088A
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FR776157A
Cited
US2409523A
Cited
BE636046A
Cited
US3222857A
Cited
US3159962A
Cited
GB1018440A
Cited
US3295305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |