US3272489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treating furnace with removable helical insert
Assignee: Pacific Scientific Co
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Filing: 1964-03-13
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Granted: 1966-09-13
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Expires: 1984-03-13
Abstract
No abstract record available.
Inventors
- 👤 Walter E Heyer
- 👤 Harold E Mescher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:25
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C21; C21D; C21D1/00; C21D1/62; C21D1/63; C21D9/00; C21D9/0031; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382; Y10T29/49384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A HEAT TREATING FURNACE COMPRISING A FURNACE CASING HAVING A HEATING CHAMBER THEREWITH, MEANS FOR HEATING SAID CHAMBER, AND A SUBSTANTIALLY CYLINDRICAL RETORT EXTENDING WITHIN SAID HEATING CHAMBER FOR ROTATION THEREIN, SAID RETORT HAVING A RELATIVELY THIN INNER LINING PROVIDED WITH A HOLLOW SMOOTH ROUNDED HELIX EXTENDING THE LENGTH THEREOF, SAID RETORT HAVING AN OUTER SUPPORT CASING FOR SUPPORTING SAID INNER LINING IN USE, SAID INNER LINING BEING OF SLIGHTLY LESSER DIAMETER THAN ITS SUPPORT CASING WHEREBY THE FORMER CAN BE SLIPPED INTO THE LATTER FOR USE AND SECURED THEREIN, SAID INNER LINING BEING READILY REMOVABLE FROM ITS SUPPORT CASING FOR REPLACEMENT OF SAID LINING WHEN WORN.
Claim 2
Dependent Claim
107 words
A HEAT TREATING FURNACE COMPRISING A FURNACE CASING HAVING A HEATING CHAMBER THEREWITH, MEANS FOR HEATING SAID CHAMBER, AND A SUBSTANTIALLY CYLINDRICAL RETORT EXTENDING WITHIN SAID HEATING CHAMBER FOR ROTATION THEREIN, SAID RETORT HAVING A RELATIVELY THIN INNER LINING PROVIDED WITH A HOLLOW SMOOTH ROUNDED HELIX EXTENDING THE LENGTH THEREOF, SAID RETORT HAVING AN OUTER SUPPORT CASING FOR SUPPORTING SAID INNER LINING IN USE, SAID INNER LINING BEING OF SLIGHTLY LESSER DIAMETER THAN ITS SUPPORT CASING WHEREBY THE FORMER CAN BE SLIPPED INTO THE LATTER FOR USE AND SECURED THEREIN, SAID INNER LINING BEING READILY REMOVABLE FROM ITS SUPPORT CASING FOR REPLACEMENT OF SAID LINING WHEN WORN.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |