Patent US3477731A successfully refreshed from Google Patents.
US3477731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure seal
Assignee: INTERN PACKINGS CORP
•
Filing: 1967-02-20
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Granted: 1969-11-11
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Woodrow Irwin Workman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:51
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3216
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE972155C
Cited
US2600516A
Cited
US2834616A
Cited
US3106405A
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US3117796A
Cited
US3215205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |