US3578553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen dioxide pulping process
Assignee: TABERT Inc
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Filing: 1968-09-10
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Granted: 1971-05-11
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Expires: 1988-09-10
Abstract
Abstract A PRIMARY PULPING PROCESS IN WHICH RAW LINGO-CELLULOSIC MATERIAL IS CONTACTED WITH NITROGEN DIOXIDE GAS AT ATMOSPHERIC PRESSURE AND AMBIENT TEMPERATURE TO PRODUCE CELLULOSIC PULP AND USEFUL BY-PRODUCTS, FOR EXAMPLE LIGNIN NITRATES AND NITRITES, WITHOUT AIR OR OTHER PLOLLUTION.
Inventors
- 👤 Madhu P Godsay
- 👤 Donald M Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:19
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/04; D21C3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |