Patent US2602029A successfully refreshed from Google Patents.
US2602029A
Expired / Lapsed
US
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Manufacture of bituminized fibrous products
Assignee: INTERNAT BITUMEN EMULSIONS Ltd
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Filing: 1946-09-17
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Granted: 1952-07-01
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Expires: 1966-09-17
Abstract
No abstract record available.
Inventors
- 👤 Bradshaw Leonard Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:48
CPC Classifications
D; D21; D21J; D21J1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE METHOD OF PRODUCING RIGID, NON-FLEXIBLE BOARDS WHICH COMPRISES FORMING A SHEET FROM APPROXIMATELY EQUAL PARTS OF FIBROUS MATERIAL AND A BINDER OF FATTY ACID PITCH MIXED WITH SULPHUR IN AMOUNT SUFFICIENT TO ACCELERATE HARDENING AND MODIFIED WITH A HARD BITUMEN, THE RATIO OF FATTY ACID PITCH TO BITUMEN IN THE BINDER BEING BETWEEN 1 TO 2.4 AND 3.5 TO 1, GRADUALLY DRYING THE SHEET AT A TEMPERATURE NOT SUBSTANTIALLY EXCEEDING 90* C. WHILE PASSING AIR THEREOVER, AND THEREAFTER BAKING THE DRIED SHEET AT A TEMPERATURE OF FROM APPROXIMATELY 150* C. TO 170* C. FOR A LENGTH OF TIME SUFFICIENT TO EFFECT POLYMERIZATION AND HARDENING OF THE BINDER TO PRODUCE A RIGID, NON-FLEXIBLE BITUMINIZED FIBER BOARD.
Claim 2
Independent Claim
116 words
THE METHOD OF PRODUCING RIGID, NON-FLEXIBLE BOARDS WHICH COMPRISES FORMING A SHEET FROM APPROXIMATELY EQUAL PARTS OF FIBROUS MATERIAL AND A BINDER OF FATTY ACID PITCH MIXED WITH SULPHUR IN AMOUNT SUFFICIENT TO ACCELERATE HARDENING AND MODIFIED WITH A HARD BITUMEN, THE RATIO OF FATTY ACID PITCH TO BITUMEN IN THE BINDER BEING BETWEEN 1 TO 2.4 AND 3.5 TO 1, GRADUALLY DRYING THE SHEET AT A TEMPERATURE NOT SUBSTANTIALLY EXCEEDING 90* C. WHILE PASSING AIR THEREOVER, AND THEREAFTER BAKING THE DRIED SHEET AT A TEMPERATURE OF FROM APPROXIMATELY 150* C. TO 170* C. FOR A LENGTH OF TIME SUFFICIENT TO EFFECT POLYMERIZATION AND HARDENING OF THE BINDER TO PRODUCE A RIGID, NON-FLEXIBLE BITUMINIZED FIBER BOARD.
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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) | 1955-07-01 | 1955-12-31 | 1956-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-01 | 1959-12-31 | 1960-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-01 | 1963-12-31 | 1964-07-01 | $7700.00 | Window Closed / Lapsed |