United States Patent 8,006,690: Scope, Claim Architecture, and US Patent Landscape
US Drug Patent 8,006,690 claims an inhaler architecture that combines (1) a powder medicament reservoir and movable metering cup, (2) a mechanical actuation mechanism that selectively allows cup travel using a yoke-ratchet gating scheme, (3) optional mechanical sub-systems including cam indexing, push-bar reset, pressure relief/sealing, de-agglomeration, and dose counting, plus (4) optional dry powder handling features. The claims are drafted as a modular mechanical “platform,” with dependent claim add-ons that tighten structure.
What does claim 1 actually cover? (Independent claim scope)
Core system elements (Claim 1)
Claim 1 requires all of the following structural elements in one medicament inhaler:
- Mouthpiece for patient inhalation.
- Delivery passageway that directs inhalation-induced airflow through the mouthpiece.
- Channel extending from the delivery passageway.
- Reservoir containing medicament, with a dispensing port connected to the channel.
- Metering cup (“cup”) received in the channel and movable between:
- a position at the dispensing port, and
- a position towards the delivery passageway.
- Cup spring that biases the cup in one direction or the other (the claim is written as either bias direction, not fixed).
- Yoke movable between at least two positions, wherein the yoke includes a ratchet that:
- prevents cup movement when yoke is in one of the positions, and
- allows cup movement when yoke is in another position.
Claim-1 functional gating (what the “ratchet/yoke” does)
The ratchet does not merely “lock” a component. It is the mechanism that defines a state machine: the cup cannot move in at least one yoke state and can move in at least one other yoke state. This gating is the claim’s highest-level novelty driver, because most other elements are standard powder-inhaler parts.
Minimum operational concept
A user action (or an actuation linked to opening/closing or cam rotation) moves the yoke between positions, switching cup movement from blocked to allowed. The cup then moves between the reservoir dispensing port and the delivery passageway.
How do dependent claims expand coverage?
How is bias direction and reset handled (Claims 2-3)?
- Claim 2 narrows Claim 1 by requiring the cup spring biases the cup from the dispensing port towards the delivery passageway.
- Claim 3 adds a push bar on the yoke that returns the cup to the dispensing port when the yoke moves from the “allowed-movement” position back to the “blocked-movement” position.
Scope impact:
Claims 2-3 convert the platform from “selectively allowed motion” into a more specific dosing cycle: dispense via cup travel away from the dispensing port, then reset back to the port via push bar return.
What do the cam and multi-position indexing claims add (Claims 4-7)?
- Claim 4 adds:
- at least one movable cam with at least two successive cam surfaces, and
- a spring biasing the yoke against the cam, so cam motion causes the yoke to successively engage successive cam surfaces and move between its at-least-two positions.
- Claim 5 specifies:
- cam includes three successive cam surfaces (moving yoke between first, second, and third positions), and
- ratchet behavior tied to those positions:
- ratchet prevents cup movement in first and second positions,
- ratchet allows cup movement in third position,
- push bar returns cup to the dispensing port upon yoke movement to the first position.
- Claim 6 ties actuation to a cover:
- a cover movable to open/close the mouthpiece,
- cam is secured to the cover, so opening/closing the mouthpiece causes yoke position changes among the first/second/third positions.
- Claim 7 specifies cam is movable by rotation.
Scope impact:
Claims 4-7 convert the yoke-ratchet gating into a cam-indexed cycle, optionally driven by opening/closing a cover. This materially narrows the actuation linkage while strengthening structural certainty for enforceability.
How is powder handling and airflow conditioning addressed (Claims 8-9)?
- Claim 8 limits the reservoir to containing a volume of dry powdered medicament.
- Claim 9 adds a de-agglomerator between the delivery passageway and the mouthpiece.
Scope impact:
These are category-defining for dry powder inhalers. De-agglomeration increases differentiation from purely metering-only devices; it can also support non-obviousness by pairing metering with airflow conditioning.
How is dose counting integrated (Claim 10)?
Claim 10 adds a dose counter with the following required structure and relationship:
- A pawl extending from the yoke.
- A dose counter including:
- a bobbin
- a rotatable spool
- a rolled ribbon received on the bobbin and rotatable about the bobbin axis
- ribbon indicia on the ribbon, advancing successively from:
- a first end secured to the spool to
- a second end positioned on the bobbin
- Teeth extending radially outward from the spool into a predetermined path of the pawl during yoke movement between its positions.
- Resulting mechanical synchronization:
- spool rotates by pawl action
- ribbon advances onto the spool during cup movement between dispensing port and delivery passageway.
Scope impact:
This claim is narrower than Claim 1 but supplies a crisp mechanical dose counter architecture. If an accused product uses different dose-counter technology (e.g., magnetic sensors, optical counters, electronic counters without mechanical pawl-teeth engagement), Claim 10 may not read.
How is pressure relief and sealing managed (Claim 11)?
Claim 11 requires all Claim 1 elements plus a pressure relief and sealing system:
- The channel includes a pressure relief port.
- There is a conduit providing fluid communication between:
- the interior of the reservoir and
- the pressure relief port.
- The cup includes:
- a recess adapted to receive medicament when aligned with the dispensing port,
- a first sealing surface that seals the dispensing port when the recess is not aligned with dispensing port,
- a second sealing surface that seals the pressure relief port when the recess is aligned with dispensing port, and
- the second sealing surface unseals the pressure relief port when the recess is not aligned with dispensing port.
Scope impact:
This is a functional sealing regime tied to alignment state (cup recess alignment). It narrows the claim to devices that actively seal/unseal both dispensing and relief flowpaths based on cup position.
What are Claims 12-13? (Additional independent claim templates)
Your provided text also includes two additional “independent” looking claim statements:
- Claim 12: repeats Claim 1 plus adds:
- movable cam with successive cam surfaces and spring-biased yoke against cam.
- Claim 13: repeats Claim 1 plus adds:
- de-agglomerator between delivery passageway and mouthpiece.
Scope impact:
These are the same platform with different independent claim combinations, designed to keep at least one claim reading even if prosecution estoppel or prior art attacks the main formulation.
Patent landscape: what this claim set implies for US competitive coverage
Where the claim “center of gravity” sits
US 8,006,690 is centered on mechanical cup metering gated by a yoke-ratchet lock, with optional cam-indexing, cover-driven actuation, powder de-agglomeration, sealing/pressure relief integration, and an electro-mechanical-free dose counter.
This claim set targets a specific mechanical class: dry powder inhalers with mechanically actuated metering cups and alignment-based sealing or switching, rather than electronic/solenoid-driven dosing or purely passive blister systems.
Likely overlap clusters to search in the US
For a US freedom-to-operate assessment, the strongest relevance will come from patents in these clusters (each cluster maps to at least one dependent claim feature):
- Dry powder inhaler metering cup + spring-biased shuttle/cup
- Ratchet or latch gating of a metering element by a movable yoke or lever
- Cam-indexed multi-position mechanical dosing cycle (especially 3-position arrangements)
- Cover-driven actuation (open/close mouthpiece coupled to dosing sequence)
- De-agglomerator modules placed downstream of a delivery passageway
- Dose counters using a mechanical pawl with a ribbon/rolled strip mechanism
- Pressure relief port + alignment-controlled sealing surfaces on a cup
Design-around pressure points
Given the claim language, potential design changes that can move products out of literal scope include:
- Replace the yoke-ratchet gating with a different motion-control architecture (e.g., continuous actuation with clutch/solenoid release, not a ratchet preventing motion in one yoke state).
- Replace cam indexed yoke sequencing with a non-cam mechanism (e.g., direct linkage or electronic control) to avoid Claims 4-7.
- Replace the specific cup recess + sealing surface regime tied to dispensing port and pressure relief port alignment (Claim 11).
- Replace the dose counter with a non-pawl mechanical mechanism (Claim 10) or move away from the ribbon/spool/bobbin arrangement.
However, even if design-around avoids dependent claims, Claim 1 still requires the yoke-ratchet cup gating plus cup spring and the cup’s positional relationship to the dispensing port and delivery passageway.
Claims-to-landscape mapping (feature matrix)
| Feature in US 8,006,690 |
Claim(s) |
Landscape search target (US) |
| Metering cup movable between dispensing port and delivery passageway |
1 |
Dry powder inhaler metering mechanisms |
| Cup spring bias direction (either or specified) |
1-2 |
Spring-biased cup/sleeve mechanisms |
| Yoke movable between positions with ratchet blocking then allowing cup motion |
1 |
Latch/ratchet gating inhalers |
| Push bar returning cup to dispensing port |
3-5 |
Reset actuators linked to dosing |
| Movable cam with successive cam surfaces; yoke spring-biased against cam |
4, 6, 7 |
Cam-indexed mechanical dosing cycles |
| Three cam surfaces; cup allowed only in third yoke position |
5 |
Multi-stage mechanical sequencing |
| Cover open/close drives cam and yoke |
6 |
Hinged/cover-coupled dosing sequences |
| Dry powdered medicament limitation |
8 |
DSPI product class constraints |
| De-agglomerator between delivery passageway and mouthpiece |
9, 13 |
Downstream de-agglomeration modules |
| Mechanical dose counter: pawl, spool, bobbin, rolled ribbon, indicia |
10 |
Ribbon-strip mechanical counters |
| Pressure relief port with conduit; cup sealing surfaces unseal relief when misaligned |
11 |
Pressure relief and alignment sealing systems |
Key Takeaways
- US 8,006,690 is anchored on a yoke-ratchet that selectively blocks and then allows movement of a spring-biased metering cup between a reservoir dispensing port and a delivery passageway.
- Dependent claims add structurally specific layers: cam-indexed multi-position sequencing, cover-coupled actuation, push-bar reset, de-agglomeration, mechanical ribbon dose counting, and alignment-controlled pressure relief sealing.
- The competitive patent landscape relevance is highest for US filings covering mechanical cup metering with gating ratchets, and for downstream add-ons like de-agglomerators, dose counters, and pressure relief sealing.
- Design-around risk is concentrated in whether an accused device uses a yoke/ratchet state machine and whether the metering element is allowed/blocked based on cup alignment.
FAQs
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Does Claim 1 require a cam or cover?
No. Claim 1 requires a yoke with a ratchet gating the cup and a cup spring bias, but cam and cover are only required in dependent claims (e.g., Claims 4-7).
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What is the single most restrictive common element across all claims you provided?
The yoke-ratchet gating that prevents cup movement in one yoke position and allows it in another, combined with a cup that moves between the dispensing port and delivery passageway.
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How does Claim 11 change the technology class?
It adds an explicit pressure relief port and cup sealing surfaces that seal/unseal the relief path based on cup recess alignment.
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Is the dose counter in Claim 10 optional?
Yes. Dose counter structure is only required if Claim 10 is asserted.
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Can a device avoid infringement by using a different dose counter?
It may avoid Claim 10, but infringement risk remains under Claim 1 if the device still uses the yoke-ratchet gating and cup metering architecture.
References
[1] United States Patent 8,006,690 (claims as provided).
