Patent US3325941A successfully refreshed from Google Patents.
US3325941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire door restraining devices
Assignee: Turnbull Elevator Ltd
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Filing: 1965-10-04
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Granted: 1967-06-20
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Expires: 1985-10-04
Abstract
No abstract record available.
Inventors
- 👤 Carl T Prucha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; E06B5/167; E05; E05B; E05B65/00; E05B65/10; E05B65/104; E06B5/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A RESTRAINING DEVICE FOR A SLIDING FIRE DOOR, ACTING TO PREVENT THE DOOR FROM BOWING, COMPRISING A PIN CONTAINING FIRST COMPONENT AND A PIN RECEIVING SECOND COMPONENT, ONE OF THE TWO COMPONENTS BEING MOUNTED ON THE FIRE DOOR AND THE OTHER COMPONENT BEING MOUNTED ON A MEMBER AGAINST WHICH THE DOOR CLOSES AND EACH COMPONENT BEING MOUNTED IN A PLANE PARALLEL TO THAT OF THE DOOR, SAID PIN RECEIVING COMPONENT BEING MOUNTED IN A LOCATION TO RECEIVE SAID PIN AND SAID PIN-CONTAINING COMPONENT COMPRISING A CHAMBER NORMALLY CONTAINING THE PIN, SLIDABLY LOCATED THEREIN IN A PLANE PARALLEL TO THE PLANE OF THE DOOR, AND A HEAT ACTUATED PIN DRIVING MECHANISM ASSOCIATED WITH THE CHAMBER, SAID DRIVING MECHANISM BEING ADAPTED TO BE ACTUATED UPON EXCESSIVE RISE IN TEMPERATURE AND BEING ADAPTED TO DRIVE THE PIN IN A PLANE PARALLEL TO THE PLANE OF THE DOOR INTO THE PIN RECEIVING COMPONENT UPON SAID ACTUATION, AND SAID RESTRAIN-
Claim 2
Dependent Claim
155 words
A RESTRAINING DEVICE FOR A SLIDING FIRE DOOR, ACTING TO PREVENT THE DOOR FROM BOWING, COMPRISING A PIN CONTAINING FIRST COMPONENT AND A PIN RECEIVING SECOND COMPONENT, ONE OF THE TWO COMPONENTS BEING MOUNTED ON THE FIRE DOOR AND THE OTHER COMPONENT BEING MOUNTED ON A MEMBER AGAINST WHICH THE DOOR CLOSES AND EACH COMPONENT BEING MOUNTED IN A PLANE PARALLEL TO THAT OF THE DOOR, SAID PIN RECEIVING COMPONENT BEING MOUNTED IN A LOCATION TO RECEIVE SAID PIN AND SAID PIN-CONTAINING COMPONENT COMPRISING A CHAMBER NORMALLY CONTAINING THE PIN, SLIDABLY LOCATED THEREIN IN A PLANE PARALLEL TO THE PLANE OF THE DOOR, AND A HEAT ACTUATED PIN DRIVING MECHANISM ASSOCIATED WITH THE CHAMBER, SAID DRIVING MECHANISM BEING ADAPTED TO BE ACTUATED UPON EXCESSIVE RISE IN TEMPERATURE AND BEING ADAPTED TO DRIVE THE PIN IN A PLANE PARALLEL TO THE PLANE OF THE DOOR INTO THE PIN RECEIVING COMPONENT UPON SAID ACTUATION, AND SAID RESTRAIN-
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) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |