Patent US2994248A successfully refreshed from Google Patents.
US2775433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned tube spacing supports
Assignee: Individual
•
Filing: 1953-08-31
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Granted: 1956-12-25
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Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 William F Matheny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:06
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0138; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB110125A
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US2243593A
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GB532968A
Cited
US2241209A
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US2362694A
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US2434519A
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US2404575A
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US2402209A
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US2535669A
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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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |