US3497997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quarterline stop control system for power driven revolving doors
Assignee: International Steel Co
•
Filing: 1968-06-14
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Granted: 1970-03-03
•
Expires: 1988-06-14
Abstract
No abstract record available.
Inventors
- 👤 Amuel E Sheckells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:23
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/608; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1119080A
Cited
US2607909A
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US2932699A
Cited
US2954971A
Cited
US3223801A
Cited
US3364620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |