Patent US3257181A successfully refreshed from Google Patents.
US3257181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for processing heat-softenable materials
Assignee: —
•
Filing: —
•
Granted: 1966-06-21
•
Expires: 1983-06-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:21
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/08; C03B37/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
237 words
IN APPARATUS FOR PRODUCING GLASS FIBERS, A MELTER OF REFRACTORY METAL, HEATING MEANS FOR HEATING SAID MELTER TO MELT GLASS MATERIALS PLACE THEREIN, SAID MELTER BEING OF U-SHAPED CROSS SECTION AND INCLUDING SPACED SIDES JOINED ALONG THE LOWER EDGES BY A TRANSVERSELY EXTENDING BOTTOM, A FEED ORIFICE IN SAID BOTTOM EXTENDING AWAY FROM SAID SIDES, AND THE MELTER HAVING AN OPEN TOP, A REFRACTORY CASING SURROUNDING SAID SIDES IN SPACED RELATION, AN OPENING IN SAID REFRACTORY CASING RECEIVING SAID BOTTOM, AND SAID CASING AROUND SAID OPENING CRADLING SAID SIDES ADJACENT TO SAID BOTTOM, AND BEING IN SEALED CONTACT WITH SAID SIDES, AND WITH SAID FEED ORIFICE EXTENDING INTO SAID OPENING AND DIRECTLY EXPOSED TO THE AMBIENT ATMOSPHERE ON THE OUTSIDE OF SAID CASING, A FEED OPENING IN SAID REFRACTORY CASING FOR FEEDING GLASS MATERIALS INTO THE OPEN TOP OF SAID MELTER, MEANS FOR INTRODUCING INERT GAS INTO THE INTERIOR OF SAID REFRACTORY CASING TO SURROUND SAID MELTER, MEANS CLOSING SAID FEED OPENING TO LIMIT ESCAPE OF GAS THEREFROM, AND A MANIFOLD ON THE OUTSIDE OF SAID REFRACTORY CASING HAVING A NOZZLE POSITIONED ADJACENT TO SAID FEED ORIFICE TO DIRECT A STREAM OF INERT GAS INTO SURROUNDING RELATIONSHIP TO SAID FEED ORIFICE, WHEREBY HOT GASES PRODUCED WITHIN SAID CASING BY CONTACT WITH SAID SIDES OF SAID MELTER ARE ISOLATED FROM SAID FEED ORIFICE TO PREVENT BURN-OFF OF FIBERS PRODUCED FROM THE FEED ORIFICE, AND RADIATION PRODUCED BY SAID
Claim 2
Dependent Claim
176 words
IN A METHOD OF PRODUCING FIBERS OF HEAT-SOFTENABLE MATERIALS BY OPERATING A MELTER OF OXIDIZABLE METAL, THE MELTER HAVING AN UPSTANDING WALL AND AN OPEN TOP, AND A BOTTOM ATTACHED TO THE LOWER EDGE OF THE WALL, WITH A FEED ORIFICE IN THE BOTTOM AND THE FEED ORIFICE EXPOSED TO THE AMBIENT ATMOSPHERE, THE STEPS OF FILLING THE MELTER WITH HEAT-SOFTENABLE MATERIAL, SURROUNDING THE WALL WITH A FIRST INERT GAS MANTLE, HEATING THE WALL TO A TEMPERATURE SUFFICIENT TO MELT HEATSOFTENABLE MATERIAL TO EXUDE THROUGH THE FEED ORIFICE IN THE BOTTOM, RETAINING THE FIRST INERT GAS MANTLE AROUND THE WALL AND OUT OF CONTACT WITH THE FEED ORIFICE AND THE MATERIAL EXUDING THEREFROM, BLOCKING RADIATION BETWEEN SAID WALL AND SAID FEED ORIFICE, SURROUNDING THE FEED ORIFICE WITH A SECOND, UNRESTRAINED, INERT GAS MANTLE, AND MAINTAINING THE TEMPERATURE OF THE SECOND INERT GAS MANTLE AT A TEMPERATURE LESS THAN THE TEMPERATURE OF SAID WALL AND THE MATERIAL EXUDING FROM SAID FEED ORIFICE BY DIRECTING A STREAM OF RELATIVELY COOL INERT GAS UPON SAID WALL AND SAID ORIFICE.
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |