US3331876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of tolylenediamines
Assignee: Bayer Corp
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Filing: 1966-03-02
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Granted: 1967-07-18
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Expires: 1986-03-02
Abstract
No abstract record available.
Inventors
- 👤 Irvin B Van Horn
- 👤 Eugene L Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:34
CPC Classifications
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Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN A PROCESS FOR THE PREPARATION OF TOLYLENEDIAMINE BY A PROCESS WHICH COMPRISES HEATING WATER AND THE DISTILLATION RESIDUE OBTAINED WHEN DISTILLING THE PRODUCT OF PHOSGENATION OF SAID TOLYLENEDIAMINE, THE IMPORVEMENT WHICH COMPRIESE HEATING SAID WATER AND SAID DISTILLATION RESIDUE AT A TEMPERATURE OF 263* C.-350*C. WHILE MIXED WITH 0.5 TO 6.25 MOLS OF ALKALI METAL HYDROXIDE AND SUFFICIENT WATER TO MAKE 1000 PARTS OF ALKALI METAL HYDROXIDE SOLUTION.
Claim 2
Dependent Claim
69 words
IN A PROCESS FOR THE PREPARATION OF TOLYLENEDIAMINE BY A PROCESS WHICH COMPRISES HEATING WATER AND THE DISTILLATION RESIDUE OBTAINED WHEN DISTILLING THE PRODUCT OF PHOSGENATION OF SAID TOLYLENEDIAMINE, THE IMPORVEMENT WHICH COMPRIESE HEATING SAID WATER AND SAID DISTILLATION RESIDUE AT A TEMPERATURE OF 263* C.-350*C. WHILE MIXED WITH 0.5 TO 6.25 MOLS OF ALKALI METAL HYDROXIDE AND SUFFICIENT WATER TO MAKE 1000 PARTS OF ALKALI METAL HYDROXIDE SOLUTION.
References Cited (Backward Citations)
GB795639A
Cited
US3128310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |