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US3473957A
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US
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Gas-permeable films and coatings from nitrogen - containing high - molecular weight products
Assignee: Kalle GmbH and Co KG
•
Filing: 1965-04-01
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Granted: 1969-10-21
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Expires: 1985-04-01
Abstract
No abstract record available.
Inventors
- 👤 Herbert Porrmann
- 👤 Walter Seifried
- 👤 Hans-Werner Meyreis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022; B; B32; B32B; B32B27/00; D; D06; D06M; D06M13/00; D06M13/322; D06M13/395; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2965614A
Cited
US2978449A
Cited
US3000757A
Cited
US3108100A
Cited
DE1112041B
Cited
DE1105155B
Cited
US3100721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |