Patent US3297405A successfully refreshed from Google Patents.
US3297405A
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US
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Method of carbonizing animal fiber materials
Assignee: Siemens Plania Werke AG
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Filing: 1964-11-23
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Granted: 1967-01-10
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Expires: 1984-11-23
Abstract
No abstract record available.
Inventors
- 👤 Sperk Edgar
- 👤 Vohler Otto
- 👤 Jeitner Franz
- 👤 Gierth Volker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:59
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/18; D01F9/32; D01F9/326; F; F16; F16L; F16L59/00; F16L59/04; H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; H01B3/485; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
THE PROCESS OF CARBONIZING ANIMAL FIBER MATERIAL, WHICH COMPRISES SUBJECTING THE ANIMAL FIBER MATERIAL TO CARBONIZING HEAT TREATMENT IN SEVERAL CONSECUTIVE STAGES OF GRADUALLY INCREASING TEMPERATURE UP TO ABOUT 1000* C., PERMITTING ACCESS OF AIR TO THE MATERIAL DURING THE FIRST STAGE, AND REDUCING SUCH ACCESS DURING THE SUBSEQUENT STAGES DOWN TO EXCLUSION OF AIR IN THE LAST STAGE, WHEREBY THE RESULTING CARBONIZED MATERIAL SUBSTANTIALLY RETAINS MECHANICAL FIBER CHARACTERISTICS OF THE STARTING MATERIAL.
Claim 2
Dependent Claim
73 words
THE PROCESS OF CARBONIZING ANIMAL FIBER MATERIAL, WHICH COMPRISES SUBJECTING THE ANIMAL FIBER MATERIAL TO CARBONIZING HEAT TREATMENT IN SEVERAL CONSECUTIVE STAGES OF GRADUALLY INCREASING TEMPERATURE UP TO ABOUT 1000* C., PERMITTING ACCESS OF AIR TO THE MATERIAL DURING THE FIRST STAGE, AND REDUCING SUCH ACCESS DURING THE SUBSEQUENT STAGES DOWN TO EXCLUSION OF AIR IN THE LAST STAGE, WHEREBY THE RESULTING CARBONIZED MATERIAL SUBSTANTIALLY RETAINS MECHANICAL FIBER CHARACTERISTICS OF THE STARTING MATERIAL.
Claim 3
Dependent Claim
74 words
THE PROCESS OF CARBONIZING ANIMAL FIBER MATERIAL, WHICH COMPRISES SUBJECTING THE ANIMAL FIBER MATERIAL TO CARBONIZING HEAT TREATMENT IN SEVERAL CONSECUTIVE STAGES OF GRADUALLY INCREASING TEMPERATURE UP TO ABOUT 1000*C., PERMITTING ACCESS OF AIR TO THE MATERIAL DURING THE FIRST STAGE, REDUCING SUCH ACCESS DURING THE SUBSEQUENT STAGES DOWN TO EXCLUSION OF AIR IN THE LAST STAGE, AND THEREAFTER GRAPHITIZING THE MATERIAL UNDER EXCLUSION OF AIR AT TEMPERATURES ABOVE 1000*C. UP TO ABOUT 3000*C.
Claim 4
Dependent Claim
74 words
THE PROCESS OF CARBONIZING ANIMAL FIBER MATERIAL, WHICH COMPRISES SUBJECTING THE ANIMAL FIBER MATERIAL TO CARBONIZING HEAT TREATMENT IN SEVERAL CONSECUTIVE STAGES OF GRADUALLY INCREASING TEMPERATURE UP TO ABOUT 1000*C., PERMITTING ACCESS OF AIR TO THE MATERIAL DURING THE FIRST STAGE, REDUCING SUCH ACCESS DURING THE SUBSEQUENT STAGES DOWN TO EXCLUSION OF AIR IN THE LAST STAGE, AND THEREAFTER GRAPHITIZING THE MATERIAL UNDER EXCLUSION OF AIR AT TEMPERATURES ABOVE 1000*C. UP TO ABOUT 3000*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |