US2787345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire resistant structural units
Assignee: OI Glass Inc
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Filing: 1952-11-19
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Granted: 1957-04-02
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Expires: 1972-11-19
Abstract
No abstract record available.
Inventors
- 👤 Leonard D Soubier
- 👤 Everett C Shuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:16
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E06; E06B; E06B5/00; E06B5/10; E06B5/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A STRUCTURAL UNIT HAVING A HIGH RESISTANCE TO FIRE AND HEAT AT A TEMPERATURE OF APPROXIMATELY 1200*F. COMPRISING AN OUTER FIREPROOF ENVELOPE HAVING A VENT ON THE SURFACE THEREOF SEALED WITH A SUBSTANCE HAVING A LOW MELTING POINT, AND A HIGHLY POROUS INTEGRATED CORE COMPLETELY FILLING SAID ENVOELOPE, SAID CORE BEING A HYDROUS CALCIUM SILICATE CRYSTALLINE COMPOUND WHOSE CRYSTALS HAVE THE FORMULA 5CAO.5SIO2H2O, SAID CORE HAVING FREE WATER THEREIN, SAID STRUCTURAL UNIT HAVING THE PROPERTY OF INCREASING ITS RESISTANCE TO FIRE AND HEAT TO AT LEAST 2000* F. UPON BEING SUBJECTED TO A TEMPERATURE OF APPROXIMATELY 1400*F., SAID VENT BEING OPENED WHEN THE SEALING SUBSTANCE THEREIN IS HEATED ABOVE ITS MELTING TEMPERATURE TO PERMIT WATER VAPOR TO ESCAPE THROUGH SAID VENT, SAID CORE BEING CONVERTED TO WOLLASTONITE HAVING THE OF APPROXIMATELY 1400* F., SAID WOLLASTONITE HAVING THE PROPERTY OF INCREASING THE RESISTANCE OF SAID STRUCTURAL UNIT TO A TEMPERATURE OF AT LEAST 2000*F.
Claim 2
Dependent Claim
153 words
A STRUCTURAL UNIT HAVING A HIGH RESISTANCE TO FIRE AND HEAT AT A TEMPERATURE OF APPROXIMATELY 1200*F. COMPRISING AN OUTER FIREPROOF ENVELOPE HAVING A VENT ON THE SURFACE THEREOF SEALED WITH A SUBSTANCE HAVING A LOW MELTING POINT, AND A HIGHLY POROUS INTEGRATED CORE COMPLETELY FILLING SAID ENVOELOPE, SAID CORE BEING A HYDROUS CALCIUM SILICATE CRYSTALLINE COMPOUND WHOSE CRYSTALS HAVE THE FORMULA 5CAO.5SIO2H2O, SAID CORE HAVING FREE WATER THEREIN, SAID STRUCTURAL UNIT HAVING THE PROPERTY OF INCREASING ITS RESISTANCE TO FIRE AND HEAT TO AT LEAST 2000* F. UPON BEING SUBJECTED TO A TEMPERATURE OF APPROXIMATELY 1400*F., SAID VENT BEING OPENED WHEN THE SEALING SUBSTANCE THEREIN IS HEATED ABOVE ITS MELTING TEMPERATURE TO PERMIT WATER VAPOR TO ESCAPE THROUGH SAID VENT, SAID CORE BEING CONVERTED TO WOLLASTONITE HAVING THE OF APPROXIMATELY 1400* F., SAID WOLLASTONITE HAVING THE PROPERTY OF INCREASING THE RESISTANCE OF SAID STRUCTURAL UNIT TO A TEMPERATURE OF AT LEAST 2000*F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |