Patent US5253986A successfully refreshed from Google Patents.
Patent US3448621A successfully refreshed from Google Patents.
US3448621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric gating system to eliminate contact interference
Assignee: McDonnell Douglas Corp
•
Filing: 1966-03-23
•
Granted: 1969-06-10
•
Expires: 1986-03-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Magda
- 👤 Bruce B Schwab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:58
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/135; H; H03; H03K; H03K21/00; H03K21/02; H03K3/00; H03K3/01; H03K3/013; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/28; H03M1/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |