US3410547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door assembly for heat treating furnaces
Assignee: Abar Ipsen Industries Inc
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Filing: 1966-09-22
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Granted: 1968-11-12
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Expires: 1986-09-22
Abstract
No abstract record available.
Inventors
- 👤 Irvin P Bielefeldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:43
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; F; F27; F27D; F27D1/00; F27D1/18; F27D1/1858
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
IN A HEAT TREATING FURNACE, THE COMBINATION OF, A WALLED STRUCTURE ENCLOSING A HEATING CHAMBER AND INCLUDING A PASSAGEWAY FOR ADMITTING WORKPIECES INTO SAID CHAMBER, FIRST AND SECOND DOORS DISPOSED ON OPPOSITE SIDES OF SAID PASSAGEWAY AND MOVABLE BACK AND FORTH ACROSS THE PASSAGEWAY BETWEEN POSITIONS OPEING AND CLOSING THE PASSAGEWAY, MECHANISM CONNECTED TO SAID FIRST DOOR FOR MOVING THE LATTER TOWARD ITS OPEN POSITION, AND MEANS CONNECTED TO SAID SECOND DOOR AND RESPONSIVE TO MOVEMENT OF SAID FIRST DOOR THROUGH A PREDETERMINED DISTANCE TOWARD ITS OPEN POSITION FOR MOVING THE SECOND DOOR TOWARD ITS OPEN POSITION.
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) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |