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Patent US3381424A successfully refreshed from Google Patents.
US3381424A
Expired / Lapsed
US
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Protective construction for lessening the weight of accumulated snow loads on the roofs of buildings, mobile homes, and other dwellings
Assignee: BYRON C BUTLER
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Filing: 1965-12-06
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Granted: 1968-05-07
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Expires: 1985-12-06
Abstract
No abstract record available.
Inventors
- 👤 Byron C Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:07
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1109399A
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US1508968A
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US1655318A
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US1899062A
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US2118474A
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US2415202A
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US2571337A
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US3100950A
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US3211163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |