US3839745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lavatory accommodation
Assignee: Portasilo Ltd
•
Filing: 1972-06-29
•
Granted: 1974-10-08
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Expires: 1992-06-29
Abstract
Abstract A chemical service unit removably connected or incorporated in portable lavatory accommodation comprises a chemical liquid container divided by a filter screen into a first compartment containing clear liquid and a second compartment receiving discharge from the accommodation. A continuously operable pump draws off flushing liquid from the second compartment and delivers it to cisterns; a by pass connection including a pressure relief valve passes liquid to the first compartment and creates the necessary back pressure in the flushing liquid. An air pump forces air into a perforated tube on the floor of the second compartment to provide air bubbles for breaking up soil.
Inventors
- 👤 J Bramall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:36
CPC Classifications
E; E03; E03D; E03D5/00; E03D5/016
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A service unit for the discharge from flushable sanitary pans, comprising: means defining an enclosure for chemical liquid materials; means dividing said enclosure into two compartments, said dividing means defining a flow path between said compartments and comprising filtering means across said flow path; inlet means for conducting the discharge from at least one sanitary pan into one of said compartments; continuously operable pump means arranged to draw filtered liquid from the other compartment and having an outlet to direct the same away from said enclosure to a sanitary pan for selective release of said filtered liquid for flushing said sanitary pan; and by-pass means connected to said outlet and arranged to direct liquid therefrom into said one compartment whereby to continuously recirculate and refilter liquid in said enclosure, said by-pass means being provided with a valve arranged to close automatically when flushing liquid flows from said outlet away from said enclosure, to thereby direct the entire output of said pump to said sanitary pan.
Claim 2
Dependent Claim
165 words
A service unit for the discharge from flushable sanitary pans, comprising: means defining an enclosure for chemical liquid materials; means dividing said enclosure into two compartments, said dividing means defining a flow path between said compartments and comprising filtering means across said flow path; inlet means for conducting the discharge from at least one sanitary pan into one of said compartments; continuously operable pump means arranged to draw filtered liquid from the other compartment and having an outlet to direct the same away from said enclosure to a sanitary pan for selective release of said filtered liquid for flushing said sanitary pan; and by-pass means connected to said outlet and arranged to direct liquid therefrom into said one compartment whereby to continuously recirculate and refilter liquid in said enclosure, said by-pass means being provided with a valve arranged to close automatically when flushing liquid flows from said outlet away from said enclosure, to thereby direct the entire output of said pump to said sanitary pan.
Claim 3
Dependent Claim
16 words
A unit as defined in claim 1 wherein said valve is a pressure operated relief valve.
Claim 4
Dependent Claim
22 words
A unit as defined in claim 1 including a removable filter arranged so that liquid drawn from said other compartment passes therethrough.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |