US3415562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic hold-open device
Assignee: BYRON H PETERSEN
•
Filing: 1967-03-15
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Granted: 1968-12-10
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Expires: 1987-03-15
Abstract
No abstract record available.
Inventors
- 👤 Byron H Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:29
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/22; E05F3/221; E05F3/222; E05C; E05C17/00; E05C17/02; E05C17/04; E05C17/12; E05C17/24; E05C17/28; E05B; E05B47/00; E05F2003/228; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/46; E05Y2201/462; E05Y2201/47; E05Y2201/474; Y; Y10; Y10S; Y10S16/00; Y10S16/17; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1075; Y10T292/1082; Y10T292/28; Y10T292/2935; Y10T292/294
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |