Invalidity dossier
US 2819590
Ventilated suit refrigeration unit
Current assignee: Garrett Corp
Added 9/21/2026, 9:37:24 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 2819590
Title: Ventilated suit refrigeration unit
Inventor: Frederick H. Green
Assignee: Garrett Corp (original and current assignee per source)
Application No.: US375743A
Filing/Priority Date: 1953-08-21
Publication (Grant) Date: 1958-01-14
Status: Expired – Lifetime (source notes legal status is an assumption, not a legal conclusion)
Purpose and Plain-Language Scope
The patent describes a fluid conditioning/refrigeration system that supplies cooled gas (air) simultaneously to two separate enclosures at different selected temperatures and pressures. The preferred embodiment serves an aircraft cabin and a pressurized/ventilated pilots suit worn inside that cabin. The system cools hot compressed gas in a heat exchanger; one portion goes to the cabin, while another portion is further cooled via an expansion turbine (which may drive a cooling fan). Turbine outlet air can be mixed with heat-exchanger air to reach a desired cabin temperature. Some air is further cooled by heat exchange, condensing out water to dry the air supplied to the suit; that dried air feeds a vortex tube producing two fractions—one below and one above the inlet temperature—with valve means responsive to suit air temperature to mix them, holding suit air in a narrow range despite wide variations in supply temperature. The stated aims include fail-safe operation so suit air does not exceed a safe upper limit, minimum component count, and different flow rates to cabin and suit (e.g., ~1–2 lb/min for a suit; ~7–10 lb/min for a small cabin). The specification notes broader utility for two enclosures generally, including cooling electronic equipment enclosures.
What the excerpt does not establish
The supplied text is incomplete/excerpted; it does not provide the full claims, complete detailed description, drawing reference numerals, all cited prior art, or the exact valve/control structures. It also does not establish litigation, ownership transfers, validity, or the full prosecution history.
Generated 10/1/2026, 10:02:01 PM
Cases on file (0)
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Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.