Patent US2602974A successfully refreshed from Google Patents.
US2602974A
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Assignee: PHILADELPHIA AIR TRANSP COMPAN
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Filing: 1948-09-24
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Granted: 1952-07-15
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Expires: 1968-09-24
Abstract
No abstract record available.
Inventors
- 👤 Smith John Wesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:32
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/02; G03D13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE343784C
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US290698A
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US1130126A
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FR516006A
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CH138614A
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US1935685A
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US1868269A
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GB413060A
Cited
US2066732A
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DE636048C
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US2130459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-15 | 1956-01-14 | 1956-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-15 | 1960-01-14 | 1960-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-15 | 1964-01-14 | 1964-07-15 | $7700.00 | Window Closed / Lapsed |