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Class Information
Number: 52/19
Name: Static structures (e.g., buildings) > With entrance for persons or objects in horizontal or inclined cover
Description: Structure comprising a horizontal or inclined cover and entrance means defining an opening for persons or objects which pass through the cover.










Sub-classes under this class:

Class Number Class Name Patents
52/21 Masonry or concrete 96
52/20 With additional enclosure structure; e.g., manhole 432


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8689488 Locking core plug Apr. 8, 2014
8661750 Systems and methods for insulating attic openings Mar. 4, 2014
8656654 Upper part for a shaft Feb. 25, 2014
8640389 Indoor security barricade Feb. 4, 2014
8596902 Panel connector Dec. 3, 2013
8595986 Energy efficient scuttle cover kits Dec. 3, 2013
8590229 Inflatable attic stairway insulation appliance Nov. 26, 2013
8572900 Decking having a removable rib Nov. 5, 2013
8555562 Locking jack for a window well cover Oct. 15, 2013
8522487 Safety hatch system and egress Sep. 3, 2013
8458965 Window well cover and accessory for use there with Jun. 11, 2013
8449216 Manhole cover safety device May. 28, 2013
8438789 Energy efficient scuttle cover kits May. 14, 2013
8413393 Insulation cover for attic closures Apr. 9, 2013
8360679 Inflow and infiltration cap and seal barrier Jan. 29, 2013
8272806 Panel connector Sep. 25, 2012
8256164 Safety hatch having rail mounting system Sep. 4, 2012
8250815 Window well cover Aug. 28, 2012
8245452 Molded sectioned riser and locking cover Aug. 21, 2012
8122680 Concrete conduit members Feb. 28, 2012
8117786 Insulation barrier for ceiling hatch openings Feb. 21, 2012
8118517 Manhole cover device Feb. 21, 2012
8006439 Closing device Aug. 30, 2011
7997031 Riser pan component for on-site waste systems Aug. 16, 2011
7975436 Utility trench cover and manufacturing method Jul. 12, 2011
7966786 Molded sectioned riser and locking cover Jun. 28, 2011
7931421 Grating Apr. 26, 2011
7926229 System for insulating attic openings Apr. 19, 2011
7914227 Thermally and electrically insulated composite manhole covers Mar. 29, 2011
7905679 Dual lifting manhole cover Mar. 15, 2011
7900403 Log staircase and a method of producing components for a log staircase Mar. 8, 2011
7896574 Self-locking manhole cover Mar. 1, 2011
7891904 Manhole cover stop mechanism Feb. 22, 2011
7861468 Window well Jan. 4, 2011
7841134 Insulator construction for pull down stairs Nov. 30, 2010
7836638 Attic access Nov. 23, 2010
7827737 Recessed plaster collar assembly Nov. 9, 2010
7798742 Security key tool for manhole access opening security device Sep. 21, 2010
7789586 Angled manhole sealing band and method for use Sep. 7, 2010
7770353 Method of sealing an attic access opening and an insulated attic access over Aug. 10, 2010
7770333 Adapter ring for on-site waste treatment or drainage systems Aug. 10, 2010
7748927 Manhole insert and tether locking apparatus and method Jul. 6, 2010
7730674 Window well Jun. 8, 2010
7726903 Manhole system Jun. 1, 2010
7712259 Sump cover system for underground liquid storage tanks May. 11, 2010
7704010 Security device for manhole access opening Apr. 27, 2010
7695213 Cam-lift for a manhole cover Apr. 13, 2010
7690165 Insulating cover Apr. 6, 2010
7650722 Insulation cover for attic closures Jan. 26, 2010
7650723 Concealed emergency attic egress system Jan. 26, 2010

1 2 3 4 5










 
 
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