Patent US2956587A successfully refreshed from Google Patents.
US2956587A
Expired / Lapsed
US
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Sectional duct
Assignee: B&C Metal Stamping Co
•
Filing: 1958-11-17
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Granted: 1960-10-18
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Expires: 1978-11-17
Abstract
No abstract record available.
Inventors
- 👤 James T Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:47
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/12; F16L23/14; F16L9/00; F16L9/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1986965A
Cited
GB517209A
Cited
US2353121A
Cited
GB685964A
Cited
US2714424A
Cited
US2917083A
Cited
US2905201A
Cited
US2921607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |