Ventilation Patents (Class 454)
- Pressure regulation (Class 454/70)
- Having automatic control means (Class 454/75)
- Aircraft (Class 454/76)
- Waterborne (Class 454/78)
- Railcar, bus, or trailer (Class 454/83)
- Freight (Class 454/118)
- Having external connection (Class 454/119)
- Seat structure (Class 454/120)
- Condensation preventer (e.g., defroster, etc.) (Class 454/121)
- Means for open window (e.g., deflector, etc.) (Class 454/128)
- Roof structure (Class 454/136)
- Having forced recirculation (Class 454/139)
- Having both inlet and outlet airways (Class 454/141)
- Having inlet airway (Class 454/143)
- Having outlet airway (Class 454/162)
- For bed or couch (Class 454/197)
- Condensation preventer (Class 454/198)
- Skylight (Class 454/199)
- With air pump (Class 454/200)
- Having air passage in sash (Class 454/211)
- Having air passage means within, attaching to, or replacing pane (Class 454/212)
- Having air passage at window top (Class 454/213)
- Having air passage between sill and bottom of sash (Class 454/214)
- Having louvers (Class 454/224)
- Tilting pane window (Class 454/225)
- Having wind deflector (Class 454/226)
- Including backdraft preventer (Class 454/227)
- Pressure regulation (Class 454/238)
- Including automatic control means (Class 454/239)
- With wind-operated air pump (Class 454/240)
- Including unitary inlet and outlet housing (Class 454/241)
- Natural ventilation including air passage through rooftop (i.e., no air pump) (Class 454/250)
- With air pump means (Class 454/251)
- Pressure regulation (Class 454/255)
- Including automatic control means (Class 454/256)
- Including backdraft preventer (Class 454/259)
- Through roof eaves or rafters (Class 454/260)
- Including structure for mixing plural air streams together (Class 454/261)
- Sleeved vent for ceiling, wall, or floor (e.g., thimble) (Class 454/270)
- Including specific cover or shield for exterior vent opening (Class 454/275)
- Including specific air distributor (e.g., register, etc.) (Class 454/284)
- With adjustable valve (e.g., damper, etc.) (Class 454/333)
- With means for liquid contact (Class 454/337)
- With air pump (Class 454/338)
- Pressure regulation (Class 454/340)
- With air pump (Class 454/341)
- Having emergency smoke handling feature (Class 454/357)
- Having readliy movable air regulating louver, damper, or cover (Class 454/358)
- Along roof ridge (Class 454/365)
- Slant roof ventilator (Class 454/366)
- Having specific cover or shield for exterior vent opening (Class 454/367)
