Patent US2927994A successfully refreshed from Google Patents.
US2927994A
Expired / Lapsed
US
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Light diffusors for illuminating devices
Assignee: EDWIN F GUTH CO
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Filing: 1957-04-12
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Granted: 1960-03-08
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Expires: 1977-04-12
Abstract
No abstract record available.
Inventors
- 👤 Sr Edwin F Guth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:42
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/02; F21V11/00; F21V11/06; F21V3/00; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1241886A
Cited
US2398624A
Cited
GB593235A
Cited
US2506951A
Cited
US2756325A
Cited
US2745001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |