Patent US3238677A successfully refreshed from Google Patents.
US3238677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant structural element
Assignee: Owens Corning
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Filing: 1963-02-08
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Granted: 1966-03-08
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Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Olive M Soubier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:09
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
IN A FIRE RESISTANT STRUCTURAL ELEMENT COMPRISING A GENERALLY RECTANGULAR, MONOLITHIC CORE OF SOLID INSULATING MATERIAL AND AN OUTER ENVELOPE COVERING SAID CORE, A PLURALITY OF ELONGATED NARROW CAVITIES DEFINING IN OPPOSITE FACES OF SAID CORE AND LONGITUDINALLY SPANNING A MAJOR PORTION OF THE DISTANCE BETWEEN OPPOSITE PERIPHERAL EDGES OF SAID FACES, SAID CAVITIES BEING ARRANGED IN OPPOSITELY STAGGERED MUTUAL RELATIONSHIP AND RESPECTIVELY DEFINING A SINUOUS LATERALLY DISPOSED CONFIGURATION PROJECTING THROUGH A MAJOR PORTION OF THE THICKNESS BETWEEN SAID OPPOSITE FACES WHEREBY SAID CORE IS PROVIDED WITH PREDETERMINED RESULTANT PLANES OF WEAKNESS CORRESPONDING TO THE SHAPE AND LOCATION OF SAID CAVITIES WITHIN SAID CORE.
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US2137184A
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US2238355A
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |