Patent US3421270A successfully refreshed from Google Patents.
US3421270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated roof
Assignee: JOHN W CHANEY
•
Filing: 1967-03-10
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Granted: 1969-01-14
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Expires: 1987-03-10
Abstract
No abstract record available.
Inventors
- 👤 John W Chaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:11
CPC Classifications
E; E04; E04B; E04B7/00; E04B7/02; E04B7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US457418A
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US1629150A
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US799544A
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US1103773A
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US1532695A
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US2047721A
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US2187087A
Cited
US2214886A
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US2245133A
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US3236014A
Cited
US3308583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |