US2616030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light intensifying attachment for electric bulbs
Assignee: Individual
•
Filing: 1949-06-17
•
Granted: 1952-10-28
•
Expires: 1969-06-17
Abstract
No abstract record available.
Inventors
- 👤 Frank G Van Dyke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:59
CPC Classifications
F; F21; F21V; F21V17/00; F21V17/04; F21V9/00; F21V9/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1487758A
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US1027621A
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US1199527A
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US1223233A
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US1813102A
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GB369786A
Cited
US1917544A
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US2178907A
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US2377718A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |