Patent US3401721A successfully refreshed from Google Patents.
US3401721A
Expired / Lapsed
US
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Removable hinged cover for a lay-in wireway
Assignee: KEYSTONE Manufacturing Co DIVISION
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Filing: 1965-11-05
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Granted: 1968-09-17
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Expires: 1985-11-05
Abstract
No abstract record available.
Inventors
- 👤 Melvin J George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:32
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/04; H02G3/0406; H02G3/0418
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |