US2604557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article operated switch
Assignee: Individual
•
Filing: 1948-03-10
•
Granted: 1952-07-22
•
Expires: 1968-03-10
Abstract
No abstract record available.
Inventors
- 👤 Paul A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:56
CPC Classifications
F; F21; F21V; F21V23/00; F21V23/04; F21V23/0414; H; H04; H04M; H04M1/00; H04M1/02; H04M1/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR783978A
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US2091148A
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FR869010A
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US2327666A
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GB593671A
Cited
GB587075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |