Patent US4424567A successfully refreshed from Google Patents.
Patent US2978262A successfully refreshed from Google Patents.
US2978262A
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US
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Assignee: Imperial Eastman Corp
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Filing: 1957-09-09
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Granted: 1961-04-04
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Expires: 1977-09-09
Abstract
No abstract record available.
Inventors
- 👤 George E Franck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
F; F16; F16L; F16L33/00; F16L33/22; F16L33/223; F16L33/224; F16L47/00; F16L47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980389A
Cited
GB485154A
Cited
US2414789A
Cited
US2499024A
Cited
US2513115A
Cited
US2464416A
Cited
US2467520A
Cited
US2768845A
Cited
US2821567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |