Patent US3535194A successfully refreshed from Google Patents.
US3535194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic leather and method of making same
Assignee: Carl Freudenberg KG
•
Filing: 1969-04-18
•
Granted: 1970-10-20
•
Expires: 1989-04-18
Abstract
No abstract record available.
Inventors
- 👤 Ernst Demme
- 👤 Theodor Schachowskoy
- 👤 Gerhard Koehnlein
- 👤 Heinrich Thile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:44
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0002; D06N3/0015; D06N3/0018; D06N3/02; D06N3/04; D06N3/042; D06N3/12; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/24802; Y10T428/24851; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/24998; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |