US3020038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Revolving door pushbar circuit controller
Assignee: International Steel Co
•
Filing: 1957-08-30
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Granted: 1962-02-06
•
Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:13
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/90; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/608; H; H01; H01H; H01H3/00; H01H3/02; H01H3/16; H01H3/161; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/43; E05Y2201/434; E05Y2800/00; E05Y2800/20; E05Y2800/21; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1134325A
Cited
US1278145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |