Patent US3234355A successfully refreshed from Google Patents.
US3234355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface heating system and unit therefor
Assignee: Individual
•
Filing: 1963-07-25
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Granted: 1966-02-08
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Expires: 1983-07-25
Abstract
No abstract record available.
Inventors
- 👤 Freeman Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A HEATING UNIT FOR SUBSURFACE HEATING INSTALLATION, COMPRISING A RELATIVELY SHALLOW TRAY INCLUDING A BOTTOM AND AN UPRIGHT FLANGE, SAID BOTTOM HAVING A PLURALITY OF SPACED OPENINGS FORMED THEREIN ARRANGED IN SPACED ROWS AT LEAST SELECTED OF SAID OPENINGS IN EACH OF SAID ROWS INCLUDING THE END OPENINGS OF EACH OF SAID ROWS, EACH FORMED WITH AN INWARDLY EXTENDING OUTWARDLY FLARED FLANGE OVERHANGING THE MARGINAL EDGE PORTION THEREOF, AND AN ELECTRICAL HEATING ELEMENT ARRANGED IN ZIG-ZAG MANNER ON SAID BOTTOM BETWEEN SAID ROWS OF OPENINGS DISPOSED AGAINST SAID FLANGES, A COVER FOR SAID TRAY INCLUDING A TOP WALL AND A DEPENDING FLANGES ADAPTED TO FIT ON THE EXTERIOR OF SAID FLANGE OF SAID BOTTOM, SAID TOP OF SAID COVER HAVING A PLURALITY OF OPENINGS FORMED THEREIN, AND HEATING ELEMENT HAVING EACH OF ITS ENDS TERMINATED ADJACENT ONE OF SAID COVER TOP OPENINGS, EACH SAID END HAVING A SPLICING WIRE SECURED THERETO EXTENDING THROUGH SAID OPENING.
Claim 2
Dependent Claim
155 words
A HEATING UNIT FOR SUBSURFACE HEATING INSTALLATION, COMPRISING A RELATIVELY SHALLOW TRAY INCLUDING A BOTTOM AND AN UPRIGHT FLANGE, SAID BOTTOM HAVING A PLURALITY OF SPACED OPENINGS FORMED THEREIN ARRANGED IN SPACED ROWS AT LEAST SELECTED OF SAID OPENINGS IN EACH OF SAID ROWS INCLUDING THE END OPENINGS OF EACH OF SAID ROWS, EACH FORMED WITH AN INWARDLY EXTENDING OUTWARDLY FLARED FLANGE OVERHANGING THE MARGINAL EDGE PORTION THEREOF, AND AN ELECTRICAL HEATING ELEMENT ARRANGED IN ZIG-ZAG MANNER ON SAID BOTTOM BETWEEN SAID ROWS OF OPENINGS DISPOSED AGAINST SAID FLANGES, A COVER FOR SAID TRAY INCLUDING A TOP WALL AND A DEPENDING FLANGES ADAPTED TO FIT ON THE EXTERIOR OF SAID FLANGE OF SAID BOTTOM, SAID TOP OF SAID COVER HAVING A PLURALITY OF OPENINGS FORMED THEREIN, AND HEATING ELEMENT HAVING EACH OF ITS ENDS TERMINATED ADJACENT ONE OF SAID COVER TOP OPENINGS, EACH SAID END HAVING A SPLICING WIRE SECURED THERETO EXTENDING THROUGH SAID OPENING.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |