Patent US3996832A successfully refreshed from Google Patents.
US3996832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punch for producing holes in foamed thermoplastic containers
Assignee: BP Corp North America Inc
•
Filing: 1975-04-10
•
Granted: 1976-12-14
•
Expires: 1995-04-10
Abstract
Abstract A hole punch having a curved cutting edge of generally the same contour as the surface being punched produces clean holes in wall of foamed plastic containers.
Inventors
- 👤 John C. Schubert
- 👤 Charles B. Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:49
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/02; B26F1/14; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0596; Y10T83/384; Y10T83/395; Y10T83/40; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9428
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A hole punch for use in the production of foamed thermoplastic containers comprising a generally concave blade edge with a reverse curvature near each edge of the blade, said blade edge having generally the same contour as the surface into which it is punched.
Claim 2
Dependent Claim
44 words
A hole punch for use in the production of foamed thermoplastic containers comprising a generally concave blade edge with a reverse curvature near each edge of the blade, said blade edge having generally the same contour as the surface into which it is punched.
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) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |