US3813731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finely perforated artifical gas and water vapor pervious wrapping for foodstuffs
Assignee: Messer Griesheim GmbH
•
Filing: 1970-12-21
•
Granted: 1974-06-04
•
Expires: 1990-12-21
Abstract
Abstract The artificial wrapping for foodstuffs comprises perforations produced by energy beams, e.g., electron beams. These perforations can be made very precisely yet extremely fine in a great variety of materials, e.g., plastic, metal, glass, ceramic, or glass-ceramic.
Inventors
- 👤 H Becker
- 👤 K Steigerwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; B26F1/31; A; A22; A22C; A22C13/00; A22C13/0013; B26F1/28; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |