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LIGHTER-THAN AIR AIRCRAFT
Definition statement
This subclass/group covers:
  • Balloons
  • Blimps
  • Zeppelins
Informative references
Attention is drawn to the following places, which may be of interest for search:
Toy balloons
Landing gear for aircraft in general
Inflatable tents
Illuminated balloons
F21S8/00P2
Meteorological balloons
Special rules of classification within this subclass

Orthogonal Indexing Code B64B 2201/00 is used for hybrid airships.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Balloon
Rigid or non-rigid free-flying (no directional control) lighter than air aircraft
Blimp
Non-rigid flight controlled lighter than air aircraft
Zeppelin
Rigid flight controlled lighter than air aircraft
Hybrid airship
Aircraft where lift is produced by both lighter than air compartments and aerodynamic surfaces (wings)
Lighter-than-air aircraft
Definition statement
This subclass/group covers:

General lighter-than-air concepts; e.g. hybrid airships.

{Arrangements for landing or taking-off e.g. alighting gear}
Definition statement
This subclass/group covers:

Landing gear for lighter-than-air aircraft.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Landing gear for aircraft in general
Non-rigid airships (B64B 1/58 takes precedence; balloons B64B 1/40)
Definition statement
This subclass/group covers:

Non-conventional balloons, e.g. of non spherical shape.

References relevant to classification in this group
This subclass/group does not cover:
Balloons
Arrangements or construction of gas bags
Informative references
Attention is drawn to the following places, which may be of interest for search:
Balloons
the profile being maintained by ties or cords connecting opposite surfaces
Definition statement
This subclass/group covers:

Non-rigid airships in which the contours of the outer covering are maintained by ties or cords connecting opposite inner surfaces of the outer covering

Informative references
Attention is drawn to the following places, which may be of interest for search:
Framework construction for rigid airships
Special rules of classification within this subclass/group

The ties or cords maintain the shape of the inflated airship (note that B64B 1/02 is related to non-rigid airships), i.e. they are essentially in tension to maintain the shape. If the ties/cords connect unsubstantial frame members and are in tension due to the pressure in the inflated airship body, they can also connect frames related to the outer covering.

Rigid airships; Semi-rigid airships (B64B 1/58 takes precedence)
Definition statement
This subclass/group covers:
  • Blimps
  • Zeppelins
  • Vacuum airships
References relevant to classification in this group
This subclass/group does not cover:
Arrangements or construction of gas-bags
Outer covering
Definition statement
This subclass/group covers:
  • Construction and materials
  • Solar panels attached to the outer covering.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Photovoltaic systems for generating electric power
Attachment to structure
Definition statement
This subclass/group covers:

Means for attaching the outer covering to the inner structure.

provided with wings or stabilising surfaces { (tail unit construction B64B 1/10; movable control surfaces B64B 1/12) }
Definition statement
This subclass/group covers:

Disposition or arrangements of wings or surfaces on the airship.

References relevant to classification in this group
This subclass/group does not cover:
Tail unit construction, e.g. constructional details of fixed tail surfaces
Constructional details of movable control surfaces
surrounding hull
Definition statement
This subclass/group covers:

Arrangement of propellers in relation to the hull

Relationship between large subject matter areas

Propellers in general are covered by B64C 11/00

Balloons (B64B 1/58 takes precedence; toy balloons A63H 27/10)
Definition statement
This subclass/group covers:

Conventional balloons of generally spherical shape where the outer cover serves as gas bag, e.g. traditional hot air balloons.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Balloons for advertising are covered
Meteorological balloons are covered
Illuminated balloons are covered
F21S8/00P2
Inflatable tents are covered
Toy balloons are covered
Arrangements or construction of gas-bags; Filling arrangements
Definition statement
This subclass/group covers:
  • Materials for balloons
  • Systems for filling the balloons
  • Constructional features of the gas bags
Informative references
Attention is drawn to the following places, which may be of interest for search:
Outercovering materials for rigid airships
Gas-bags surrounded by separate containers of inert gas
Definition statement
This subclass/group covers:

Gas-bags separated by containers of inert gas, e.g. ballonets for altitude control.

Mooring attachments (mooring masts B64F)
Definition statement
This subclass/group covers:

Arrangements or devices on the airship for mooring.

References relevant to classification in this group
This subclass/group does not cover:
Mooring masts for airships or balloons
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013