US2676928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cellular products
Assignee: Ringwood Chemical Corp
•
Filing: 1951-01-19
•
Granted: 1954-04-27
•
Expires: 1971-01-19
Abstract
No abstract record available.
Inventors
- 👤 Robert L Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/107
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
88 words
IN A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC MATERIALS IN CELLULAR FORM, THE STEPS INCLUDING ADMIXING POLYVINYL CHLORIDE WITH A N-NITROSO BETA AMINO KETONE SELECTED FROM THE GROUP CONSISTING OF N-NITROSO TRIACETONE AMINE AND N-ALKYL N-NITROSO DIACETONE AMINES, AND A BASIC SUBSTANCE IN AN AMOUNT SUFFICIENT TO ACCELERATE THE THERMAL DECOMPOSITION OF SAID N-NITROSO BETA AMINO KETONE, HEATING THE RESULTING MIXTURE TO CAUSE DECOMPOSITION OF THE N-NITROSO BETA AMINO KETONE WITH THE GENERATION OF NITROGEN AND ALLOWING SAID NITROGEN TO EXPAND THE MIXTURE TO PRODUCE A CELLULAR STRUCTURE.
References Cited (Backward Citations)
US2299593A
Cited
US2491709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |