US3618778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-treating apparatus
Assignee: Ethyl Corp
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Filing: 1969-05-22
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Granted: 1971-11-09
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Expires: 1989-05-22
Abstract
Abstract A liquid-treating unit particularly suited for the treatment of liquid waste by aerobic bacterial action includes a module made of alternate flat and corrugated sheets of a thermoplastic material. The corrugated sheets are joined to the flat sheets at the apices of the corrugations. The corrugations have flat apices and reinforced sidewalls to enhance the strength of the module.
Inventors
- 👤 Joseph H Benton
- 👤 Joseph A Self
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:18
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/101; B; B01; B01J; B01J19/00; B01J19/32; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32203; B01J2219/3221; B01J2219/32213; B01J2219/3222; B01J2219/32224; B01J2219/32227; B01J2219/32248; B01J2219/32251; B01J2219/324; B01J2219/32483; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
In the liquid-treating unit as set forth in claim 1 wherein said plastic material comprises a polyvinyl chloride homopolymer.
Claim 2
Dependent Claim
46 words
In the liquid-treating unit as set forth in claim 1 wherein the outer wall of each of the end corrugations in said corrugated sheet is substantially straight and provides a flat surface at its terminal end which is joined to one of said adjacent flat sheets.
Claim 3
Dependent Claim
38 words
In the liquid-treating unit as set forth in claim 1 wherein the end portions of the sidewalls of each corrugation is provided with short, arcuate-shaped projections extending generally in the direction of the median line through said corrugation.
Claim 4
Dependent Claim
27 words
In the liquid-treating unit as set forth in claim 3 wherein said end corrugations each provide at least one generally triangular-shaped flat area in its flat apex.
Claim 5
Dependent Claim
50 words
In the liquid-treating unit as set forth in claim 1 wherein the edges of said flat sheets and the edges of said sheets providing corrugations therein that lie in a plane perpendicular to the median line through said corrugations are of a greater thickness than the remainder of said sheets.
Claim 6
Dependent Claim
37 words
In the liquid treating unit as set forth in claim 1 wherein said flat apices of said corrugated sheet are joined to said flat sheet over the full length of said apices by means of an adhesive.
Claim 7
Dependent Claim
26 words
In the liquid-treating units as set forth in claim 6 wherein said edges are of a thickness of from about one-eighth inch to about seven-sixteenths inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |