Patent US2818500A successfully refreshed from Google Patents.
US2818500A
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Prismatic reflectors
Assignee: Holophane Corp
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Filing: 1953-07-03
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Granted: 1957-12-31
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Expires: 1973-07-03
Abstract
No abstract record available.
Inventors
- 👤 Franck Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:19
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/02; G; G02; G02B; G02B5/00; G02B5/12; G02B5/122; G02B5/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT47274B
Cited
GB190908324A
Cited
US1259493A
Cited
FR608044A
Cited
US1758977A
Cited
GB294069A
Cited
US1838971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |