US3021253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pergamyn
Assignee: Phrix Werke AG
•
Filing: 1958-02-03
•
Granted: 1962-02-13
•
Expires: 1978-02-03
Abstract
No abstract record available.
Inventors
- 👤 Opderbeck Fritz
- 👤 Trapp Gunther
- 👤 Worner Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:32
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
IN A METHOD OF PRODUCING PERGAMYN, THE STEPS OF DIGESTING WOOD PULP; BEATING THE THUS-FORMED DIGESTED CELLULOSE PULP IN THE PRESENCE OF A CELLULOSE-DIGESTING ENZYME; AND CONVERTING THE THUS-BEATEN PULP TO PERGAMYN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |