Patent US2674686A successfully refreshed from Google Patents.
US2674686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling illumination
Assignee: Research Corp
•
Filing: 1950-04-04
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Granted: 1954-04-06
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Expires: 1970-04-04
Abstract
No abstract record available.
Inventors
- 👤 Laurence S Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:22
CPC Classifications
F; F21; F21S; F21S2/00; F21S8/00; F21S8/02; F21V; F21V23/00; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2511764A
Cited
US1888103A
Cited
US1962648A
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US2265323A
Cited
US2010849A
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US2156087A
Cited
US2422378A
Cited
US2447923A
Cited
US2492946A
Cited
US2527031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |