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US3179285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole fusible joint and improved gasket
Assignee: Individual
•
Filing: 1963-04-15
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Granted: 1965-04-20
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Expires: 1983-04-15
Abstract
No abstract record available.
Inventors
- 👤 Frees Joseph H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
F; F16; F16J; F16J13/00; F16J13/16; F16J13/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
A MANHOLE COVER FOR LIQUID CONTAINERS COMPRISING: (A) A CYLINDRICALLY SHAPED RING; (B) A FIRST COVER CONSISTING OF A FLAT CIRCULAR MEMBER FORMED WITH A CENTRAL OPENING AND ON ONE OPEN END OF SAID CYLINDRICALLY SHAPED RING; (C) MEANS FOR SEALING SAID FIRST COVER TO ONE OPEN END OF SAID RING; (D) A LOCKING ARM PIVOTALLY ATTACHED TO SAID FIRST COVER AND DISPOSED FOR PIVOTAL MOVEMENT TO PROJECT OVER THE CENTRAL OPENING OF SAID FIRST COVER MEANS; (E) A FLEXIBLE FILL COVER ATTACHED TO SAID LOCKING ARM AND DISPOSED TO COVER AND SEAL SAID CENTRAL OPENING OF SAID FIRST COVER MEANS WHEN SAID LOCKING ARM IS PROJECTED OVER SAID CENTRAL OPENING, SAID FLEXIBLE FILL COVER BEING FURTHER DISPOSED TO SPRING UPWARDLY AND VENT SAID CONTAINER UPON PREDETERMINED MAXIMUM PRESSURE OCCURRING WITHIN SAID CONATINER; (F) MEANS FOR MAINTAINING SAID LOCKING ARM AS PROJECTED OVER SAID CENTRAL OPENING OF SAID FIRST COVER; AND (G) FUSIBLE MEANS POSITIONED BETWEEN SAID LOCKING ARM AND SAID FLEXIBLE FILL COVER, SAID FUSIBLE MEANS DISPOSED TO MELT AT A PREDETERMINED TEMPERATURE TO RELEASE SAID FILL COVER FOR LIMITED UPWARD MOVEMENT SO AS TO FREELY VENT SAID CONTAINER.
Claim 2
Dependent Claim
190 words
A MANHOLE COVER FOR LIQUID CONTAINERS COMPRISING: (A) A CYLINDRICALLY SHAPED RING; (B) A FIRST COVER CONSISTING OF A FLAT CIRCULAR MEMBER FORMED WITH A CENTRAL OPENING AND ON ONE OPEN END OF SAID CYLINDRICALLY SHAPED RING; (C) MEANS FOR SEALING SAID FIRST COVER TO ONE OPEN END OF SAID RING; (D) A LOCKING ARM PIVOTALLY ATTACHED TO SAID FIRST COVER AND DISPOSED FOR PIVOTAL MOVEMENT TO PROJECT OVER THE CENTRAL OPENING OF SAID FIRST COVER MEANS; (E) A FLEXIBLE FILL COVER ATTACHED TO SAID LOCKING ARM AND DISPOSED TO COVER AND SEAL SAID CENTRAL OPENING OF SAID FIRST COVER MEANS WHEN SAID LOCKING ARM IS PROJECTED OVER SAID CENTRAL OPENING, SAID FLEXIBLE FILL COVER BEING FURTHER DISPOSED TO SPRING UPWARDLY AND VENT SAID CONTAINER UPON PREDETERMINED MAXIMUM PRESSURE OCCURRING WITHIN SAID CONATINER; (F) MEANS FOR MAINTAINING SAID LOCKING ARM AS PROJECTED OVER SAID CENTRAL OPENING OF SAID FIRST COVER; AND (G) FUSIBLE MEANS POSITIONED BETWEEN SAID LOCKING ARM AND SAID FLEXIBLE FILL COVER, SAID FUSIBLE MEANS DISPOSED TO MELT AT A PREDETERMINED TEMPERATURE TO RELEASE SAID FILL COVER FOR LIMITED UPWARD MOVEMENT SO AS TO FREELY VENT SAID CONTAINER.
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) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |