Patent US3978616A successfully refreshed from Google Patents.
US3978616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pet door
Assignee: NORTH STATES INDUSTRIES Inc
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Filing: 1975-06-04
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Granted: 1976-09-07
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Expires: 1995-06-04
Abstract
Abstract A door for closing an opening through a pet confining wall in a building, kennel, pen or the like, said door having a peripheral frame for mounting in the wall opening, a door member having its upper edge portion hinged to the frame on a horizontal axis for swinging movement of the door in either direction from a vertical closed position within the frame, and a spring tensioned slide acting between the frame and a cam on the upper edge of the door to yieldably retain the door in closed position.
Inventors
- 👤 Everett C. Pennock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:17
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/1246; E05F1/1253; E05F1/1261; E06; E06B; E06B7/00; E06B7/28; E06B7/32; E05D; E05D11/00; E05D11/10; E05D11/1028; E05D11/105; E05D11/1064; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
199 words
In a pet door assembly for mounting in an opening in a shelter wall to permit entrance or exit of an animal pet at its will, a. a frame for mounting on the wall to define a doorway within said opening, b. a flat door having substantially the same shape and size as said doorway positioned to close the doorway and having its upper portion hinged to the frame on a horizontal axis for swinging movement of the door from a normal vertical closed position within the doorway to open positions in either direction, c. said door having an upwardly facing cam on the upper edge thereof, said cam having a dome shape in cross section perpendicular to the plane of the door and having rounded cam surfaces connected by a flat central portion which is parallel to the upper edge of the door, d. a slide member mounted on the upper portion of the frame for vertical sliding movement and having a flat bottom face in flush engagement with the flat central portion of the cam, and e. spring means disposed between the slide and the frame to yieldably retain said face and portion in such flush engagement.
Claim 2
Dependent Claim
199 words
In a pet door assembly for mounting in an opening in a shelter wall to permit entrance or exit of an animal pet at its will, a. a frame for mounting on the wall to define a doorway within said opening, b. a flat door having substantially the same shape and size as said doorway positioned to close the doorway and having its upper portion hinged to the frame on a horizontal axis for swinging movement of the door from a normal vertical closed position within the doorway to open positions in either direction, c. said door having an upwardly facing cam on the upper edge thereof, said cam having a dome shape in cross section perpendicular to the plane of the door and having rounded cam surfaces connected by a flat central portion which is parallel to the upper edge of the door, d. a slide member mounted on the upper portion of the frame for vertical sliding movement and having a flat bottom face in flush engagement with the flat central portion of the cam, and e. spring means disposed between the slide and the frame to yieldably retain said face and portion in such flush engagement.
Claim 3
Dependent Claim
17 words
The subject matter of claim 1 wherein said door and cam are formed of hard plastic material.
Claim 4
Dependent Claim
24 words
The subject matter of claim 1 wherein the assembly is provided with two of said cams and slide members mounted in horizontally spaced relation.
Claim 5
Dependent Claim
41 words
The subject matter of claim 1 wherein the door is provided with a slidable latch member near its lower edge and the frame is provided with a socket for receiving the latch member to positively lock the door in closed position.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |