Patent US4307543A successfully refreshed from Google Patents.
US4307543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door
Assignee: Novopan AG
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Filing: 1979-09-17
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Granted: 1981-12-29
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Expires: 1999-09-17
Abstract
Abstract A door is disclosed which is primarily intended for application as a door being resistant to fire. This door having a more particularly metal frame, whereby disposed on the door frame is a material which foams under the effect of an increased temperature. Said material is applied in the form of a strip in the rebate of the door frame. Further, said material can be protected by means of a cover being wider than the strip of said foamable material, whereby the projecting portions of the cover bear tightly against the frame. One projecting part of the cover is disposed in one of the rooms, and the other projecting portion in the other of the rooms separated from one another by the door.
Inventors
- 👤 Hans Schulthess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:12
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; E06B5/164
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
205 words
A door for separating two rooms and comprising: a frame member having a side which, in use, is presented to one of the two rooms and also having a marginal region, adjacent said side, which is generally U-shaped in cross-section, that surface of the marginal region which forms the base of the U-shaped cross-section bounding an opening for providing, in use, communication between the rooms; a door leaf having an edge which confronts said surface of the marginal region of the frame member when the door is closed; a strip of material which foams under the influence of an increased temperature and is disposed in the space between said surface of the marginal region of the frame member and the edge of the door leaf; and a cover for the strip of foamable material, said cover comprising a band which is wider than said surface of the marginal region and has edge regions, the band having an angular cross-section and the edge regions thereof extending in angular relationship to said surface of the marginal region of the frame member and bearing in sealing relationship against the side faces of the marginal region of the frame member, whereby said strip is secured to the frame member.
Claim 2
Dependent Claim
205 words
A door for separating two rooms and comprising: a frame member having a side which, in use, is presented to one of the two rooms and also having a marginal region, adjacent said side, which is generally U-shaped in cross-section, that surface of the marginal region which forms the base of the U-shaped cross-section bounding an opening for providing, in use, communication between the rooms; a door leaf having an edge which confronts said surface of the marginal region of the frame member when the door is closed; a strip of material which foams under the influence of an increased temperature and is disposed in the space between said surface of the marginal region of the frame member and the edge of the door leaf; and a cover for the strip of foamable material, said cover comprising a band which is wider than said surface of the marginal region and has edge regions, the band having an angular cross-section and the edge regions thereof extending in angular relationship to said surface of the marginal region of the frame member and bearing in sealing relationship against the side faces of the marginal region of the frame member, whereby said strip is secured to the frame member.
Claim 3
Dependent Claim
75 words
A door according to claim 1, wherein said marginal region of the frame member is defined between said side of the frame member and an elongate recess which extends substantially parallel to said side and is generally U-shaped in cross-section, that surface of the recess which forms the base of the U-shaped cross-section being substantially parallel to said surface of the marginal region, said marginal region and said recess having a side face in common.
Claim 4
Dependent Claim
12 words
A door according to claim 1, wherein the cover is of PVC.
Claim 5
Dependent Claim
19 words
A door according to claim 1, wherein the cover is of aluminum and the strip is packed in aluminum.
Claim 6
Dependent Claim
53 words
A door according to claim 1, wherein the frame member defines a rebate having a first flank formed by said surface of the marginal region of the frame member and a second flank which extends substantially perpendicular to said first flank, and a strip of non-flammable material is disposed on said second flank.
Claim 7
Dependent Claim
22 words
A door according to claim 1, wherein said foamable material is a material which loses its foaming property upon contamination by moisture.
Claim 8
Dependent Claim
15 words
A door according to claim 6, wherein said foamable material is an aqueous sodium silicate.
Claim 9
Dependent Claim
24 words
A door according to claim 6 or 7, wherein the strip of foamable material is packed in foil to protect against penetration of moisture.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |