Patent US2170871A successfully refreshed from Google Patents.
US2170871A
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US
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Dustproof fixture
Assignee: Benjamin Electric Manufacturing Co
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Filing: 1935-04-27
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Granted: 1939-08-29
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Expires: 1955-04-27
Abstract
No abstract record available.
Inventors
- 👤 George F Niemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:14
CPC Classifications
F; F21; F21V; F21V25/00; F21V25/12; F21S; F21S8/00; F21S8/04; F21S8/06; F21V15/00; F21V15/02; F21V17/00; F21V17/10; F21V17/12; F21V29/00; F21V29/15; F21V31/00; F21V7/00; F21V7/0025; F21V27/00; F21V27/02; F21V3/00
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) | 1942-08-28 | 1943-02-27 | 1943-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-28 | 1947-02-27 | 1947-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-28 | 1951-02-27 | 1951-08-29 | $7700.00 | Window Closed / Lapsed |