US3145811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated fireproof building column
Assignee: Lally Column Co
•
Filing: 1961-04-17
•
Granted: 1964-08-25
•
Expires: 1981-04-17
Abstract
No abstract record available.
Inventors
- 👤 George E Strehan
- 👤 Ernest J Kortlander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:59
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; E04B1/943; E04C; E04C3/00; E04C3/30; E04C3/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A PREFABRICATED FIREPROOF COLUMN COMPRISING AN INNER CASING HAVING A LOAD-BEARING CORE THEREIN, AN OUTER CASING SPACED TRANSVERSELY FROM THE INNER CASING AND LONGITUDINALLY DISPOSED INTERMEDIATE THE ENDS OF THE INNER CASING, THERMAL INSULATION DISPOSED IN THE SPACE BETWEEN SAID CASINGS, A VENTILATING DUCT FIXED TO THE EXTERIOR SURFACE OF THE INNER CASING AND LEADING TOWARD THE TOP THEREOF, A PLURALITY OF VENT PORTS IN THE WALL OF THE INNER CASING COMMUNICATING WITH SAID DUCT, HEAT-MELTABLE PLUGS IN SAID PORTS, INSULATION-CONFINING PLUGS DISPOSED IN THE
References Cited (Backward Citations)
US312349A
Cited
US750456A
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US795362A
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US1523977A
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US2192933A
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GB515819A
Cited
US2787345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |