US3581978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crossed-bottom sack
Assignee: Windmoeller and Hoelscher KG
•
Filing: 1969-03-19
•
Granted: 1971-06-01
•
Expires: 1989-03-19
Abstract
Abstract A sack of thermoplastic material having a bottom comprising, in its opened, partially formed condition, a pair of opposing corner flaps coated with adhesive on the upper sides thereof and a pair of opposing side flaps coated with adhesive on the under sides thereof, said side flaps having been folded toward each other and laid flat with their adhesive coatings exposed upwardly, and a bottom covering sheet coated with adhesive on one side thereof attached to said side flaps with their respective adhesive coatings in contact.
Inventors
- 👤 Hermann Kappelhoff
- 👤 Max Gennerich
- 👤 Walter Steinbeck
- 👤 Willy Niemeyer
- 👤 Walter Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:47
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A sack of thermoplastic material having a bottom comprising, in its opened, partially formed condition, a pair of opposing corner flaps coated with adhesive on the upper sides thereof and a pair of opposing side flaps coated with adhesive on the under sides thereof, said side flaps having been folded toward each other and laid flat with their adhesive coatings exposed upwardly, and a bottom covering sheet coated with adhesive on one side thereof attached to said side flaps with their respective adhesive coatings in contact.
Claim 2
Dependent Claim
86 words
A sack of thermoplastic material having a bottom comprising, in its opened, partially formed condition, a pair of opposing corner flaps coated with adhesive on the upper sides thereof and a pair of opposing side flaps coated with adhesive on the under sides thereof, said side flaps having been folded toward each other and laid flat with their adhesive coatings exposed upwardly, and a bottom covering sheet coated with adhesive on one side thereof attached to said side flaps with their respective adhesive coatings in contact.
Claim 3
Dependent Claim
22 words
A sack as defined in claim 1, characterized in that the bottom side flaps overlap each other only in a narrow area.
Claim 4
Dependent Claim
32 words
A sack as defined in claim 1, characterized in that the bottom side flaps overlap each other in a wide area, and the outer bottom side flap has apertures of substantial area.
Claim 5
Dependent Claim
30 words
A sack as defined in claim 1, further comprising a valve tube coated with adhesive on both sides adhered to one of the corner flaps and the bottom covering sheet.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |