Patent US3662918A successfully refreshed from Google Patents.
US3662918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced septic tank
Assignee: Individual
•
Filing: 1970-08-24
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Granted: 1972-05-16
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Expires: 1990-08-24
Abstract
Abstract A septic tank, which may be converted into a grease trap. The tank is preferably made of plastic reinforced with fiber glass and it is further reinforced due to the construction. The tank is light weight, therefore easy to install, is durable and resistant to corrosion due to ground moisture, and will not deteriorate because of exposure to acids and alkalies. The cover of the present tank interfits with the tank in fluid tight relation. It is readily converted into a grease trap by the addition of an extension onto the outlet pipe which extends downward into the tank.
Inventors
- 👤 David D Crawford
- 👤 John W Elvington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:12
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; C; C02; C02F; C02F3/00; C02F3/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
106 words
A reinforced septic tank construction comprising: a. a unitary plastic tank reinforced with fiber glass and having an enclosing said wall and a bottom wall, b. at least two conduits connected in fluid communication with the interior of said tank and having downturned ends terminating at different levels within said tank, c. a cover fitted on said unitary plastic tank, 1. said cover having an opening formed therein centrally thereof, which opening is of less diameter than said cover, 2. reinforcing ribs radiating from said opening in said cover and terminating adjacent the periphery thereof, 3. a removable closure fitted in said opening in said cover.
Claim 2
Dependent Claim
106 words
A reinforced septic tank construction comprising: a. a unitary plastic tank reinforced with fiber glass and having an enclosing said wall and a bottom wall, b. at least two conduits connected in fluid communication with the interior of said tank and having downturned ends terminating at different levels within said tank, c. a cover fitted on said unitary plastic tank, 1. said cover having an opening formed therein centrally thereof, which opening is of less diameter than said cover, 2. reinforcing ribs radiating from said opening in said cover and terminating adjacent the periphery thereof, 3. a removable closure fitted in said opening in said cover.
Claim 3
Dependent Claim
15 words
reinforcing ribs radiating from said opening in said cover and terminating adjacent the periphery thereof,
Claim 4
Dependent Claim
15 words
reinforcing ribs radiating from said opening in said cover and terminating adjacent the periphery thereof,
Claim 5
Dependent Claim
49 words
A reinforced septic tank construction, as defined in claim 1; wherein a. said cover has an annular, peripheral recess formed in the lower side thereof, b. said peripheral recess in said cover is formed by downwardly extending portions of said cover both exterior and interior of said tank, and
Claim 6
Dependent Claim
51 words
A reinforced septic tank construction, as defined in claim 1; wherein a. said opening, formed centrally of said cover, has an upstanding annular wall therearound to form a neck, which neck is in communication with the interior of said tank, and b. said closure being complementally fitted within said upstanding neck.
Claim 7
Dependent Claim
10 words
a removable closure fitted in said opening in said cover.
Claim 8
Dependent Claim
10 words
a removable closure fitted in said opening in said cover.
Claim 9
Dependent Claim
37 words
A reinforced septic tank construction, as defined in claim 1; wherein a. said unitary plastic tank has plane faces joined to form angular reinforcing corners for a portion of the height thereto to for a polygonal tank.
Claim 10
Dependent Claim
72 words
A reinforced septic tank construction, as defined in claim 4; wherein a. each said conduit connected in fluid communication with the interior of said tank has a flange on the outer end thereof, b. each said flange adapted to be in abutting relation with a plane face of said polygonal tank, when fitted within said tank, and c. each said flange being bonded to said respective plane faces, when fitted in place.
Claim 11
Dependent Claim
68 words
A reinforced septic tank construction, as defined in claim 5; wherein a. each said conduit connected in fluid communication with the interior of said tank having a large outer recess formed therein to receive one size pipe in fluid tight relation, and b. said pipe being of a different diameter immediately inward from said outer recess to complementally receive pipe of another size in fluid tight relation therewith.
Claim 12
Dependent Claim
107 words
A reinforced septic tank construction, as defined in claim 1; wherein a. said conduits connected with the interior of said tank are ells, and each is of unitary plastic construction, b. each said conduit having a flanged outer end adapted to fit in complementary relation with a side of said plastic tank, which is reinforced with fiber glass, and c. each said conduit hAving an outer recess formed therein, which recess is adapted to receive one size pipe thereinto in fluid tight relation, a portion of the conduit connected within said recess having another diameter to receive a pipe of a smaller diameter in fluid tight relation.
Claim 13
Dependent Claim
41 words
A reinforced septic tank construction, as defined in claim 7; wherein a. one of said downturned conduits in said tank is adapted to receive a tubular extension on the lower end thereof to convert said plastic tank into a grease trap.
References Cited (Backward Citations)
US2673459A
Cited
FR1043819A
Cited
US2787397A
Cited
US3109813A
Cited
US3115281A
Cited
US3241701A
Cited
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |