Invalidity dossier
US 5412653
Dynamic switch cascading system
Current assignee: International Business Machines Corp
Added 9/23/2026, 3:47:43 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US5412653A — Dynamic Switch Cascading System
Title: Dynamic switch cascading system
Patent number: US5412653A (application US08/138,288)
Assignee: International Business Machines Corporation (original and current assignee as listed)
Inventors: Karl H. Hoppe; Laura H. McGoogan; Leon Skarshinski; Michael E. Underkoffler
Key dates:
- Priority date: 1993-10-15
- Filing date: 1993-10-15
- Publication (grant) date: 1995-05-02
- Anticipated expiration: 2013-10-15
- Legal status as listed: Expired – Fee Related
Purpose (from the supplied text): The invention relates to a system for making dynamic connections in a computer environment, and particularly to a system providing dynamic cascading of multiple circuit switches interconnected via cross-links.
Plain-language scope: Per the definitions supplied, a "link" is the transmission medium. "Dynamic switch cascading" is the interconnection of two or more dynamic switches using dynamic connections. A "dynamic switch cascade" is a collection of dynamic switches interconnected to accomplish dynamic switch cascading. A "cross-link" is a link used to interconnect two dynamic switches for this purpose; a "cross-link group" is the collection of cross-links between two individual dynamic switches. A "switch port" is a link interface of a dynamic switch node, while an "end-point port" is a link interface of an end-point node. Classifications listed include H04L49/00 and H04L49/15 (packet switching elements; interconnection of switching modules) and G06F15/173 family (interprocessor communication using interconnection networks).
What the excerpt does not establish: The supplied text contains only front-matter, classification, and definitions material. It does not include the claims, detailed description, drawings, or any prior-art references beyond the "prior art keywords" listing (port, switch, link, cross, frame). Accordingly, this overview cannot state the specific claimed scope, embodiments, or how the system operates in practice. It also does not establish inventorship disputes, ownership changes, validity, or litigation, and no such matters were researched.
Source: https://patents.google.com/patent/[US5412653](/patent/US5412653)/en
Generated 10/1/2026, 9:51:21 PM
Cases on file (0)
Specific litigation cases in our database that name US patent 5412653. The free-form analysis below may also discuss cases beyond this list.
No cases on file mention this patent. Upload a CSV or add a case manually in Admin → Manage litigation cases.
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.