US3672749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sight glass for the inside inspection of pipes and cleaning of same
Assignee: Individual
•
Filing: 1970-09-11
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Granted: 1972-06-27
•
Expires: 1990-09-11
Abstract
Abstract A SIGHT GLASS PLUG HAVING A THREADED OUTER PORTION FOR CONNECTION TO A STANDARD BUILDING PIPE FITTING AND A HOLLOW INTERPORTION HAVING A CIRCULAR SEAT AND A SPACED APART RECESS IN THE SURFACE THEREOF FOR HOLDING AN O-RING, A GLASS VIEWING WINDOW, AND A SNAP-RING IN SEALING ENGAGEMENT WITH THE INNER SURFACE OF THE PLUG. A VALVE CONTROLLED INLET ALLOWS PRESSURIZED FLUID TO IMPINGE AGAINST THE GLASS AND THE PLUG HOUSING INTERIOR AT A DOUBLE INCLINATION TO ENSURE VORTEX CLEANING OF THE SAME.
Inventors
- 👤 Kenneth F Roser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:05
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/2476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |