Patent US3294729A successfully refreshed from Google Patents.
US3294729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing the viscosity of polymeric nu-vinyl lactams by adding n2h4 and h2o2
Assignee: GAF Chemicals Corp
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Filing: 1963-09-18
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Granted: 1966-12-27
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Expires: 1983-09-18
Abstract
No abstract record available.
Inventors
- 👤 Eugene V Hort
- 👤 Grosser Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:28
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/28; C08F; C08F8/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
THE PROCESS OF INCREASING THE VISCOSITY OF POLYMERIC N-VINYL LACTAMS WHICH CONSISTS OF TREATING A POLYMERIC N-VINYL LACTAM IN THE FORM OF AQUEOUS SOLUTION WITH HYDRAZINE AND HYDROGEN PEROXIDE ADDED SEPARATELY TO SAID POLYMERIC LACTAM IN APPROXIMATELY THE MOLE RATIO OF AT LEAST 2 OF HYDROGEN PEROXIDE TO 1 OF HYDRAZINE.
Claim 2
Dependent Claim
51 words
THE PROCESS OF INCREASING THE VISCOSITY OF POLYMERIC N-VINYL LACTAMS WHICH CONSISTS OF TREATING A POLYMERIC N-VINYL LACTAM IN THE FORM OF AQUEOUS SOLUTION WITH HYDRAZINE AND HYDROGEN PEROXIDE ADDED SEPARATELY TO SAID POLYMERIC LACTAM IN APPROXIMATELY THE MOLE RATIO OF AT LEAST 2 OF HYDROGEN PEROXIDE TO 1 OF HYDRAZINE.
Claim 3
Dependent Claim
51 words
THE PROCESS OF INCREASING THE VISCOSITY OF POLYMERIC N-VINYL LACTAMS WHICH CONSISTS OF TREATING A POLYMERIC N-VINYL LACTAM IN THE FORM OF AQUEOUS EMULSION WITH HYDRAZINE AND HYDROGEN PEROXIDE ADDED SEPARATELY TO SAID POLYMERIC LACTAM IN APPROXIMATELY THE MOLE RATIO OF AT LEAST 2 OF HYDROGEN PEROXIDE TO 1 OF HYDRAZINE.
Claim 4
Dependent Claim
51 words
THE PROCESS OF INCREASING THE VISCOSITY OF POLYMERIC N-VINYL LACTAMS WHICH CONSISTS OF TREATING A POLYMERIC N-VINYL LACTAM IN THE FORM OF AQUEOUS EMULSION WITH HYDRAZINE AND HYDROGEN PEROXIDE ADDED SEPARATELY TO SAID POLYMERIC LACTAM IN APPROXIMATELY THE MOLE RATIO OF AT LEAST 2 OF HYDROGEN PEROXIDE TO 1 OF HYDRAZINE.
References Cited (Backward Citations)
US2927913A
Cited
US2821519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |