Patent US3581331A successfully refreshed from Google Patents.
US3581331A
Expired / Lapsed
US
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Fire protection shield
Assignee: Teledyne Brown Engineering Inc
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Filing: 1968-10-01
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Granted: 1971-06-01
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Expires: 1988-10-01
Abstract
Abstract A SHIELD FOR ENCLOSING A PLATFORM BETWEEN TWO ENCLOSURES IN NORMALLY HELD IN A RETRACTED POSITION SPACED FROM ONE OF THE ENCLOSURES. IN THE PRESENCE OF ABNORMALLY HIGH TEMPERATURES GENERATED BY A FIRE, THE SHIELD IS MOVED TO ITS EXTENDED POSITION WHERE IT ENCLOSES THE PLATFORM. THE SHIELD, WHICH MAY INCLUDE A RESILIENT SEALING RIM, IS COVERED WITH S HEAT INSULATING MATERIAL WHICH EXPANDS IN THE PRESENCE OF FIRE.
Inventors
- 👤 Perry N Fisher
- 👤 Howard E Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:36
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/30; B64F1/305; B64F1/3055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |