US2628550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator for telephone booths
Assignee: AT&T Inc
•
Filing: 1948-04-16
•
Granted: 1953-02-17
•
Expires: 1968-04-16
Abstract
No abstract record available.
Inventors
- 👤 John H King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
E; E04; E04H; E04H1/00; E04H1/12; E04H1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2056041A
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US1929776A
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GB419440A
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US2126230A
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US2189008A
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FR837842A
Cited
US2267425A
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US2318393A
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US2296314A
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US2363839A
Cited
US2321907A
Cited
US2334056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |