US3917530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to counteract a clogging of drain pipes
Assignee: Individual
•
Filing: 1974-07-15
•
Granted: 1975-11-04
•
Expires: 1994-07-15
Abstract
Abstract Clogging of underground drain pipe is prevented by provision of tannin dispensing products around the drain pipes in concentrations providing 70-100 grams of tannin per meter length of drain pipe available for radial flow into the drain pipe wall along with locally draining ground water. T
Inventors
- 👤 Johann Boske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:15
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; E; E02; E02B; E02B11/00; E02B11/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
A METHOD OF PREVENTING THE CLOGGING OF NONMETALLIC UNDERGROUND DRAIN PIPES WHICH HAS POROUS WALLS ENVELOPED BY FILTER MATERIAL WHEREIN LOCAL GROUND WATER IS DRAINED BY RADICAL INFLOW THROUGH SAID WALLS COMPRISNG,
Claim 2
Independent Claim
32 words
A METHOD OF PREVENTING THE CLOGGING OF NONMETALLIC UNDERGROUND DRAIN PIPES WHICH HAS POROUS WALLS ENVELOPED BY FILTER MATERIAL WHEREIN LOCAL GROUND WATER IS DRAINED BY RADICAL INFLOW THROUGH SAID WALLS COMPRISNG,
Claim 3
Dependent Claim
13 words
A method according to claim 1, wherein the reagent is a natural tannin.
Claim 4
Dependent Claim
13 words
A method according to claim 1, wherein the reagent is a synthetic tannin.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein the reagent is added by the natural flow of water through the drain pipe.
Claim 6
Dependent Claim
25 words
A method according to claim 1, wherein the reagent is applied to the surface of the drainage ground above the pipe that is buried underground.
Claim 7
Dependent Claim
15 words
A method according to claim 1, wherein said filter material is inoculated with said reagent.
Claim 8
Dependent Claim
23 words
A method according to claim 1, wherein a stock of the reagent is provided by impregnation into the material of the drain pipe.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |