Patent US2674297A successfully refreshed from Google Patents.
US2674297A
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Method of manufacturing ducts
Assignee: Arrowhead Rubber Co
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Filing: 1949-05-06
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Granted: 1954-04-06
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Expires: 1969-05-06
Abstract
No abstract record available.
Inventors
- 👤 Fred A Greenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:56
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/581; B29C53/582; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/083; B29C70/085; B29K; B29K2083/00; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2309/00; B29K2309/08; B29L; B29L2023/00; B29L2023/18; Y; Y10; Y10S; Y10S138/00; Y10S138/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US375877A
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US1352740A
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US2168366A
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US2256386A
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US2258218A
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US2226523A
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US2434465A
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US2539853A
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US2525076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |