Patent US2638576A successfully refreshed from Google Patents.
US2638576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp holder mounted on continuous conductor
Assignee: John B. Pierce Laboratory
•
Filing: 1948-11-16
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Granted: 1953-05-12
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Expires: 1968-11-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph F O'brien
- 👤 John B Cataldo
- 👤 Kenneth E Vroom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:00
CPC Classifications
F; F21; F21S; F21S4/00; F21S4/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US646009A
Cited
US838811A
Cited
US864427A
Cited
US918617A
Cited
US1220608A
Cited
US1291268A
Cited
US1616176A
Cited
US2215715A
Cited
US2313960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |