Patent US3307994A successfully refreshed from Google Patents.
US3307994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated paperboard and method of making the same
Assignee: Waldorf Paper Products Co
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Filing: 1964-06-30
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Granted: 1967-03-07
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Expires: 1984-06-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Raymond G Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:40
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2804; B32; B32B; B32B27/00; Y; Y10; Y10S; Y10S229/00; Y10S229/939; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24736
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD OF FORMING DOUBLE FACE CORRUGATED PAPERBOARD HAVING A MOISTURE PROFF CORRUGATED MEDIUM COMPRISING THE STEPS OF: CORRUGATING A WEB OF PAPERBOARD, APPLYING ADHESVIE TO ONE SIDE THEREOF. APPLYING A FIRST LINER TO THE ADHESIVELY COATED SIDE OF SAID CORRUGATED WEB, EXTRUDING A FILM OF POLYOLEFIN MATERIAL UPON A SECOND LINER, APPLYING THE POLYOLEFIN COATED SURFACE OF THE SECOND LINER TO THE OTHER SURFACE OF THE CORRUGATED WEB, SUBJECTING THE SECOND LINER TO HEAT SUFFICIENT TO RENDER THE FILM TACKY AND TO ADHERE THE SECOND LINER TO THE CORRUGATED WEB.
Claim 2
Independent Claim
91 words
A METHOD OF FORMING DOUBLE FACE CORRUGATED PAPERBOARD HAVING A MOISTURE PROFF CORRUGATED MEDIUM COMPRISING THE STEPS OF: CORRUGATING A WEB OF PAPERBOARD, APPLYING ADHESVIE TO ONE SIDE THEREOF. APPLYING A FIRST LINER TO THE ADHESIVELY COATED SIDE OF SAID CORRUGATED WEB, EXTRUDING A FILM OF POLYOLEFIN MATERIAL UPON A SECOND LINER, APPLYING THE POLYOLEFIN COATED SURFACE OF THE SECOND LINER TO THE OTHER SURFACE OF THE CORRUGATED WEB, SUBJECTING THE SECOND LINER TO HEAT SUFFICIENT TO RENDER THE FILM TACKY AND TO ADHERE THE SECOND LINER TO THE CORRUGATED WEB.
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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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |