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US3103789A
Expired / Lapsed
US
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Drainage pipe
Assignee: Lidco Inc
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Filing: 1962-06-01
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Granted: 1963-09-17
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Expires: 1982-06-01
Abstract
No abstract record available.
Inventors
- 👤 Leon E Mcduff
- 👤 Jr John J Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; E; E02; E02B; E02B11/00; E02B11/005; Y; Y10; Y10S; Y10S138/00; Y10S138/07
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
A SUBSURFACE DRAINAGE PIPE COMPRISING: A FOAMED PLASTIC PIPE HAVING AT LEAST ONE VOID THEREIN; A FIBERGLASS MATTING FILLING SAID VOID WITH SAID PLASTIC PERMEATING A PORTION ONLY OF SAID MATTING.
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) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |