Patent US2087685A successfully refreshed from Google Patents.
Patent US2839671A successfully refreshed from Google Patents.
US2839671A
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US
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Light-diffusing unit
Assignee: HARRY H SHEARIN
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Filing: 1956-01-13
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Granted: 1958-06-17
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Expires: 1976-01-13
Abstract
No abstract record available.
Inventors
- 👤 James L Cullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:22
CPC Classifications
F; F21; F21V; F21V11/00; F21V11/06; F21Y; F21Y2103/00; Y; Y10; Y10T; Y10T24/00; Y10T24/44; Y10T24/44641; Y10T24/44769; Y10T24/44923; Y10T24/44932
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1136006A
Cited
US1659409A
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US1765652A
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US1962648A
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US2299256A
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US2677046A
Cited
US2659808A
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GB699993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |