Patent US2800323A successfully refreshed from Google Patents.
US2800323A
Expired / Lapsed
US
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Door-operating system
Assignee: PPG Industries Inc
•
Filing: 1951-10-02
•
Granted: 1957-07-23
•
Expires: 1971-10-02
Abstract
No abstract record available.
Inventors
- 👤 George L West
- 👤 Kunzl Andrew Edward
- 👤 Glenwood M Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:17
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53; Y; Y10; Y10S; Y10S60/00; Y10S60/903
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |