Patent US3564796A successfully refreshed from Google Patents.
US3564796A
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US
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Interment crypt drain and gas exhaust
Assignee: Individual
•
Filing: 1969-01-02
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Granted: 1971-02-23
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Expires: 1989-01-02
Abstract
Abstract AN INTERMENT CRYPT IS PROVIDED HAVING A FLUID EXHAUST DEVICE. A CONDUIT EXTENDS FROM THE CRYPT THROUGH A CHECK VALVE AND TO A VERTICALLY EXTENDING TUBE TERMINATING IN AN AIR CHAMBER DEFINED BY A GLOBE. THE FLUID PASSING THROUGH THE CONDUIT EXITS AS THE VALVE INTO THE AIR CHAMBER AND THEN DISSIPATES INTO THE GROUND. WITH THIS CONSTRUCTION, THE NEED FOR SPECIAL SUMPS AND COMPLEX EXHAUST SYSTEMS IS ELIMINATED.
Inventors
- 👤 John A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:05
CPC Classifications
E; E04; E04H; E04H13/00; E04H13/005
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |