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US1820899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting appliance
Assignee: Individual
•
Filing: 1924-04-10
•
Granted: 1931-08-25
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Expires: 1944-04-10
Abstract
No abstract record available.
Inventors
- 👤 Greenewalt Mary Hallock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:38
CPC Classifications
F; F21; F21S; F21S10/00; F21S10/007; F21S10/02; F21V; F21V7/00; F21V7/04; F21V7/09
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) | 1934-08-24 | 1935-02-23 | 1935-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-24 | 1939-02-23 | 1939-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-24 | 1943-02-23 | 1943-08-25 | $7700.00 | Window Closed / Lapsed |