US3050502A
Expired / Lapsed
US
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Diazo condensation polymers
Assignee: Polychrome Corp
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Filing: 1959-01-29
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Granted: 1962-08-21
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Expires: 1979-01-29
Abstract
No abstract record available.
Inventors
- 👤 Mellan Ibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:15
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; C; C08; C08G; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; C08G16/0231; C09; C09B; C09B41/00; Y; Y10; Y10S; Y10S534/00; Y10S534/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A CONDENSATION PROCESS WHICH COMPRISES CONTACTING THE DOUBLE ZINC CHLORIDE SALT OF PARA DIAZO NITROSO DIPHENYL WITH FORMALDEHYDE IN ADMIXTURE WITH SULFURIC ACID AND AT A TEMPERATURE IN THE RANGE OF ABOUT AMBIENT TEMPERATURE TO 70*C.; AND THEREAFTER RECOVERING THE CONDENSATION PRODUCT FROM THE SULFURIC ACID SOLUTION.
Claim 2
Dependent Claim
47 words
A CONDENSATION PROCESS WHICH COMPRISES CONTACTING THE DOUBLE ZINC CHLORIDE SALT OF PARA DIAZO NITROSO DIPHENYL WITH FORMALDEHYDE IN ADMIXTURE WITH SULFURIC ACID AND AT A TEMPERATURE IN THE RANGE OF ABOUT AMBIENT TEMPERATURE TO 70*C.; AND THEREAFTER RECOVERING THE CONDENSATION PRODUCT FROM THE SULFURIC ACID SOLUTION.
References Cited (Backward Citations)
US2679498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |