US3094199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat latch for fire doors
Assignee: Individual
•
Filing: 1961-02-03
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Granted: 1963-06-18
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Expires: 1981-02-03
Abstract
No abstract record available.
Inventors
- 👤 George R Wallmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:53
CPC Classifications
E; E05; E05B; E05B65/00; E05B65/10; E05B65/104; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0974; Y10T292/1014; Y10T292/1021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A HEAT LATCH SAFETY RELEASE FOR FIRE DOORS COMPRISING A MOUNTING PLATE ADAPTED TO BE MOUNTED ON A VERTICAL SURFACE OF A DOOR, A PRESSURE PLATE MOVABLY MOUNTED ON SAID MOUNTING PLATE FOR MOVEMENT TOWARD AND AWAY FROM SAID MOUNTING PLATE, RESILIENT MEANS BIASED BETWEEN SAID PRESSURE PLATE AND SAID MOUNTING PLATE FOR URGING SAID PRESSURE PLATE AWAY FROM SAID MOUNTING PLATE, MEANS INCLUDING A HEAT-FUSIBLE LINK FOR NORMALLY HOLDING SAID PRESSURE PLATE TOWARD SAID MOUNTING PLATE, MEANS TO LIMIT OUTWARD MOVEMENT OF SAID PRESSURE PLATE AWAY FROM SAID MOUNTING PLATE UPON FUSING OF SAID LINK, AND MEANS FOR OPERATIVELY CONNECTING SAID PRESSURE PLATE TO A LATCHING MECHANISM OF THE DOOR TO LOCK THE DOOR WHEN SAID PRESSURE PLATE IS MOVED AWAY FROM SAID MOUNTING PLATE AND UNLOCK THE DOOR WHEN SAID PRESSURE PLATE IS MOVED TOWARD SAID MOUNTING PLATE.
Claim 2
Dependent Claim
140 words
A HEAT LATCH SAFETY RELEASE FOR FIRE DOORS COMPRISING A MOUNTING PLATE ADAPTED TO BE MOUNTED ON A VERTICAL SURFACE OF A DOOR, A PRESSURE PLATE MOVABLY MOUNTED ON SAID MOUNTING PLATE FOR MOVEMENT TOWARD AND AWAY FROM SAID MOUNTING PLATE, RESILIENT MEANS BIASED BETWEEN SAID PRESSURE PLATE AND SAID MOUNTING PLATE FOR URGING SAID PRESSURE PLATE AWAY FROM SAID MOUNTING PLATE, MEANS INCLUDING A HEAT-FUSIBLE LINK FOR NORMALLY HOLDING SAID PRESSURE PLATE TOWARD SAID MOUNTING PLATE, MEANS TO LIMIT OUTWARD MOVEMENT OF SAID PRESSURE PLATE AWAY FROM SAID MOUNTING PLATE UPON FUSING OF SAID LINK, AND MEANS FOR OPERATIVELY CONNECTING SAID PRESSURE PLATE TO A LATCHING MECHANISM OF THE DOOR TO LOCK THE DOOR WHEN SAID PRESSURE PLATE IS MOVED AWAY FROM SAID MOUNTING PLATE AND UNLOCK THE DOOR WHEN SAID PRESSURE PLATE IS MOVED TOWARD SAID MOUNTING PLATE.
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) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |