Patent US2906294A successfully refreshed from Google Patents.
US2906294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct structure for pipes
Assignee: Individual
•
Filing: 1953-11-27
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Granted: 1959-09-29
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Expires: 1973-11-27
Abstract
No abstract record available.
Inventors
- 👤 Earl C Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:06
CPC Classifications
F; F16; F16L; F16L3/00; F16L3/16; F16L3/18; F16L59/00; F16L59/12; F16L59/14; F16L59/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US384860A
Cited
US1744102A
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US1834549A
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US1861436A
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US1910594A
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US1987517A
Cited
US2041243A
Cited
US2081867A
Cited
US2355966A
Cited
US2483050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |