United States Patent 11,083,831 Filter Apparatus Scope, Claim-by-Claim Coverage, and US Patent Landscape
US Patent 11,083,831 claims a multi-cartridge filter apparatus with a specific mechanical architecture: multiple filter cartridges held by parallel upper/lower housing plates with rotatable coupling, plus outlet flange plumbing that passes through the upper plate. The dependent claims narrow coverage to IV-pole style clamps, transparent cartridge tubes in enumerated polymer families, conical outlet flanges, connector flange interfaces, and activated carbon filter media including hydrogel-coated activated carbon.
What does US Patent 11,083,831 claim protect for a multi-cartridge filter system?
Independent claim 1: core claim elements and technical scope
Claim 1 protects a “filter apparatus” made of three integrated sub-systems:
A. Multi-cartridge arrangement
- “Two or more filter cartridges”
- Each cartridge has:
- A first end with an inlet and a first screen
- A second end with an outlet and a second screen
- Walls configured to contain filter media
- A cartridge tube
B. Outlet flange-to-connector interface
- “Outlet of each filter cartridge is connected to an outlet connector by an outlet flange”
- This outlet flange is a structural requirement that drives both manufacturing and design-around risk.
C. Parallel housing plates with rotatable coupling
- A “housing” with:
- “upper plate and a lower plate oriented substantially parallel to each other”
- plates are configured “to hold the two or more filter cartridges in about the same orientation”
- each plate defines “two or more openings”
- Coupling geometry requirement:
- cartridges are “rotatably coupled” to the openings
- Critical positional plumbing requirement:
- “the outlet flange connected to each outlet connector extends through the … openings of the upper plate”
D. External mounting
- “an attachment clamp connected to the housing”
- This is left broad in claim 1, then narrowed in dependent claims (pole clamp, IV pole clamp).
Functional consequence for scope: the claim is not just about filter media (activated carbon); it is about the physical integration of multi-cartridge filtration in a dual-plate frame with rotatable coupling and specific outlet flange penetration through the upper plate.
Independent claim 13: parallel second independent claim with condensed recitation
Claim 13 again protects a filter apparatus with:
- “two or more filter cartridges” (same inlet/outlet/screen/walls/cartridge tube concept)
- upper/lower plate housing holding cartridges in about the same orientation
- openings in both plates to rotatably engage cartridges
- one or more support elements connecting plates
- attachment clamp connected to the housing
Claim 13 is a broader structural “assembly claim” than the media-specific dependent claims, and it overlaps heavily with claim 1. Key differences:
- Claim 13 explicitly calls out support elements as part of the independent set (“one or more support elements”).
- Claim 13 does not restate the “outlet flange extends through … openings of the upper plate” limitation in the independent text you provided (that limitation is present explicitly in claim 1).
Net effect: claim 1 is the strongest “mechanical plumbing” capture; claim 13 is the strongest “frame + support + clamp + rotatable cartridges” capture.
How do the dependent claims narrow the mechanical and media scope?
Attachment clamp limitations
- Claim 5: “attachment clamp is a pole clamp”
- Claim 15: “attachment clamp is an IV pole clamp”
This narrows the mounting interface to standard IV-pole style clamps. If competitors mount on wall brackets, benchtop frames, carts, or custom housings without a “pole clamp” style, these dependent claims may be avoided while claim 1/13 could still remain in play depending on how “attachment clamp connected to the housing” is interpreted.
Housing support elements
- Claim 2: housing further comprises one or more support elements connecting upper and lower plates
- Claim 4: support elements comprise combination of rods and support plates
This is a design-variable area. If an alternative uses different geometry (e.g., U-channel beams, cast frames, polymer ribs), it can undercut dependent claims 2 and 4. It does not necessarily remove independent claim 1 coverage since claim 1 does not require support elements.
Cartridge tube material and optical/chemical design
- Claim 6: cartridge tube is transparent material selected from:
- polysulfone
- polycarbonate
- polypropylene
- acrylic
- Claim 17: cartridge tube is transparent (no polymer list in claim 17)
Transparent tube material and resin selection is a classic design-around lever. If a competitor uses a transparent tube outside the enumerated polymer list, it may avoid claim 6 while still potentially falling within claim 1/13 and claim 17 (if their tube is still “transparent”).
Inlet/outlet connector flange geometries
- Claim 7: inlet includes an inlet connector
- Claim 9: inlet connector connected to cartridge tube by an inlet flange
- Claim 8: outlet flange is conical
- Claim 18: outlet connector connected to cartridge tube by a conical outlet flange
These are narrow geometry constraints. In practice, “conical” vs. cylindrical or spherical sealing interfaces is a key interpretation point. If the flange shape is not conical, dependent claims 8 and 18 may be avoided.
Filter media composition
- Claim 10: filter media comprises activated carbon
- Claim 11: filter media is hydrogel coated activated carbon
- Claim 19: filter media comprises activated carbon
- Claim 20: filter media is hydrogel coated activated carbon
The strongest chemical/composition hook is hydrogel-coated activated carbon. If the media is activated carbon without hydrogel coating, claim 11/20 are avoidable. If hydrogel-coated carbon is used, composition-level avoidance is difficult.
What is the real claim scope: where infringement risk is highest?
Highest-risk claim elements for competitors
- Multi-cartridge form factor (2+ cartridges) with each cartridge having inlet/outlet + screens + media-containing walls and cartridge tube.
- Housing with parallel upper and lower plates with openings for rotatable coupling.
- Outlet flange/connector interface passing through openings of the upper plate (explicitly in claim 1).
- Attachment clamp for pole/IV pole (dependent claim exposure if that mounting architecture is used).
- Hydrogel-coated activated carbon (chemical exposure if used).
Most practical design-arounds
- Remove or change the outlet flange passing through the upper plate openings (target claim 1’s distinctive plumbing limitation).
- Alter cartridge mounting so cartridges are not “rotatably coupled” to the plate openings (tight mechanical requirement; could be replaced with fixed mounts with external articulation).
- Switch mounting away from a pole clamp / IV pole clamp form factor (aim at claims 5 and 15).
- Use transparent tube polymers outside the enumerated list in claim 6 (aim at claim 6; keep transparency for claim 17).
- Avoid hydrogel coating on activated carbon (aim at claims 11 and 20).
- Change outlet flange shape away from “conical” (aim at claims 8 and 18).
What patent estate landscape typically surrounds US 11,083,831 for filter cartridges and housings?
The claim language points to two overlapping IP clusters:
- Filter cartridge architecture (inlet/outlet screens, media containment, cartridge tube).
- System mechanics (multi-cartridge manifold-style housing, dual-plate rotatable coupling, mounting clamp, connector/flange routing).
- Adsorptive media (activated carbon and hydrogel-coated activated carbon).
Even without external bibliographic pull, the claim set itself indicates likely prior art and adjacent filing families:
- Cartridge manufacturers typically patent cartridge end fittings and screen/media separation structures.
- System integrators typically patent manifold housings, mounting clamps, and connector/flange interface geometry.
- Media suppliers typically patent surface treatments for carbon (including hydrogel coatings).
Business implication: a competitor can face two different non-overlapping obstacles:
- A design barrier from the mechanical assembly claims (1/13 and dependent mechanical features).
- A product barrier from the media claims (11/20).
How does the claim structure affect freedom-to-operate for multi-cartridge IV filtration?
Scenario-based risk mapping (mechanical vs. media)
If a competitor uses activated carbon but not hydrogel-coated carbon
- Risk remains under claim 1/13 and dependent mechanical claims (2-9, 12, 15-18 depending on architecture).
- Hydrogel-related dependent claims (11/20) are likely off-target.
If a competitor uses hydrogel-coated activated carbon but a different housing architecture
- Media-dependent claims can still be asserted (11/20 depend on claim 1/13’s apparatus foundation).
- If the housing lacks “rotatably coupled” cartridge mounting or lacks the upper plate openings routing requirement, apparatus-level claims may be avoided even with identical media.
If a competitor matches the frame but changes outlet flange routing
- A strong claim-1 design-around is to change whether the outlet flange connected to each outlet connector extends through the openings of the upper plate.
What is likely covered by the combination of independent claims 1 and 13?
Scope overlap and internal “redundancy”
- Claims 1 and 13 both require:
- 2+ cartridges
- dual-plate housing
- cartridge insertion through openings
- rotatable coupling concept
- cartridge inlet/outlet with screens and walls containing media
- attachment clamp connected to the housing
But claim 1 adds a distinctive plumbing routing requirement (outlet flange extending through the upper plate openings). Claim 13 instead makes support elements part of the independent claim.
Net: the patent is drafted to preserve coverage through at least one independent path even if a single distinctive element is missing.
Which claim limitations look most like “novelty anchors” from a patent prosecution perspective?
Anchors are the limitations that are:
- structurally specific,
- likely not common across generic multi-cartridge filter rigs,
- and appear only in one place among the claims.
From the provided claim set, the most anchor-like elements are:
- Outlet flange connected to each outlet connector extends through the openings of the upper plate (claim 1).
- Rotatably coupled cartridge mounting in the plate openings (claims 1 and 13).
- Support elements connecting upper and lower plates and the optional rods + support plates (claims 2 and 4).
- Hydrogel coated activated carbon (claims 11 and 20).
Key Takeaways
- US 11,083,831 is a mechanical-system patent: it protects a multi-cartridge filter apparatus with dual parallel plates, rotatable coupling, and specific outlet flange/connector routing through upper plate openings (claim 1), plus mounting via an attachment clamp.
- The dependent claims add targeted narrowing: pole/IV pole clamps, transparent cartridge tube polymers, conical outlet flanges, and activated carbon vs hydrogel-coated activated carbon.
- The most credible design-arounds are architectural: change the outlet flange routing, eliminate rotatable coupling through plate openings, avoid pole/IV clamp mounting, or avoid hydrogel coating on activated carbon.
FAQs
1) Does US 11,083,831 require hydrogel-coated activated carbon to infringe?
No. Hydrogel-coated activated carbon is limited to dependent claims 11 and 20. Activated carbon is covered by dependent claims 10 and 19.
2) What single limitation is most likely to be used for a design-around strategy?
Claim 1’s requirement that the outlet flange connected to each outlet connector extends through the openings of the upper plate.
3) If a product uses a non-IV mounting bracket, does it avoid the patent?
It may avoid dependent claims 5 and 15 (pole/IV pole clamps), but not necessarily the independent claims, which only require “an attachment clamp connected to the housing.”
4) Are rotatable cartridge mounts essential to claim coverage?
Yes. Both independent claims recite cartridges “rotatably coupled” to openings in the housing plates.
5) Can a competitor keep activated carbon but change the housing and still risk infringement?
Yes. Even with standard activated carbon (not hydrogel-coated), the apparatus mechanical limitations in claims 1 and 13 can still drive infringement risk.
References
- United States Patent No. 11,083,831.
