Patent US1831800A successfully refreshed from Google Patents.
US1831800A
Expired / Lapsed
US
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Door operating device
Assignee: Lyon Metal Products LLC
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Filing: 1930-05-01
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Granted: 1931-11-17
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Expires: 1950-05-01
Abstract
No abstract record available.
Inventors
- 👤 James E Bales
- 👤 Carl T Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:53
CPC Classifications
E; E05; E05D; E05D11/00; E05D11/10; E05D11/1014; E05D11/1028; E05D11/105; E05D11/1064; E05Y; E05Y2900/00; E05Y2900/20; Y; Y10; Y10S; Y10S16/00; Y10S16/07; Y10T; Y10T292/00; Y10T292/08; Y10T292/0876; Y10T292/0883; Y10T292/0884
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-11-16 | 1935-05-18 | 1935-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-11-16 | 1939-05-18 | 1939-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-11-16 | 1943-05-18 | 1943-11-17 | $7700.00 | Window Closed / Lapsed |