Patent US2667776A successfully refreshed from Google Patents.
US2667776A
Expired / Lapsed
US
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Under liquid seal for rotatable shafts
Assignee: Apex Electrical Manufacturing Co
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Filing: 1950-10-31
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Granted: 1954-02-02
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Expires: 1970-10-31
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Kortepeter
- 👤 Ralph L Archbold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:16
CPC Classifications
D; D06; D06F; D06F17/00; D06F17/06; D06F13/00; D06F13/02; D06F39/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1554299A
Cited
US1832352A
Cited
US2023107A
Cited
US1741317A
Cited
US1999662A
Cited
US2042575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |