Patent US2790464A successfully refreshed from Google Patents.
US2790464A
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Insulated duct
Assignee: Gustin Bacon Manufacturing Co
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Filing: 1953-02-13
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Granted: 1957-04-30
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Expires: 1973-02-13
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Stephens
- 👤 Glenn W Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; F; F16; F16L; F16L59/00; F16L59/14; F16L59/143; F16L59/16; F16L59/18; F16L59/182; F16L9/00; F16L9/14; F24; F24F; F24F13/00; F24F13/02; F24F13/0263; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/128; B29K2503/00; B29K2503/04; B29L; B29L2023/00; B29L2023/22; B29L2023/225; Y; Y10; Y10S; Y10S264/00; Y10S264/53; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2094; Y10T83/2192; Y10T83/2194
Claims Analysis
Total Claims: 0
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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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |