US4010298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underground irrigation devices and methods of making and using the same
Assignee: Individual
•
Filing: 1975-12-03
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Granted: 1977-03-01
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Expires: 1995-12-03
Abstract
Abstract A perforated pipe method of making a perforated pipe suitable for subsurface irrigation laterals by forming indentations and perforations in indentations of sheet material then rolling the sheet material into a tube or pipe.
Inventors
- 👤 William M. Angle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:18
CPC Classifications
E; E02; E02B; E02B13/00; B; B26; B26F; B26F1/00; B26F1/0015; B29; B29C; B29C53/00; B29C53/36; B29C67/00; B29C67/0011; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038; Y10T156/1052; Y10T156/1056; Y10T428/00; Y10T428/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
67 words
In a method of making perforated pipe by steps including rolling perforated flat sheet material into tubular form, the improvement comprising: indenting said flat sheet material to form a depression therein, forming a jagged edge about an aperture within said depression by punching said material from a side opposite said depression and rolling said sheet material into a tube with said depression opening exteriorly of said tube.
Claim 2
Dependent Claim
67 words
In a method of making perforated pipe by steps including rolling perforated flat sheet material into tubular form, the improvement comprising: indenting said flat sheet material to form a depression therein, forming a jagged edge about an aperture within said depression by punching said material from a side opposite said depression and rolling said sheet material into a tube with said depression opening exteriorly of said tube.
Claim 3
Dependent Claim
8 words
The product of the method of claim 1.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |