US3128220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and machine for making flexible duct connector stock and resultant product
Assignee: Individual
•
Filing: 1959-07-09
•
Granted: 1964-04-07
•
Expires: 1979-07-09
Abstract
No abstract record available.
Inventors
- 👤 Martin M Gracer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:35
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/02; F; F16; F16L; F16L21/00; F16L21/002; F16L21/005; F16L27/00; F16L27/10; F16L27/107; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T428/00; Y10T428/19; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24231; Y10T428/2424; Y10T428/24248; Y10T428/24256; Y10T428/31504; Y10T428/31652; Y10T428/31656
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A FLEXIBLE DUCT CONNECTOR STOCK FOR JOINING THE EDGES OF DUCTS COMPRISING TWO ELONGATED SHEET METAL STRIPS AND A LENGTH OF DUCT SEALING FABRIC, SAID STRIPS EACH HAVIN A SIDE MARGINAL PORTION FOLDED OVER TOWARD THE STRIP AND CLAMPINGLY ENGAGING A DIFFERENT SIDE EDGE OF SAID LENGTH OF FABRIC TO SANDWICH SAID SIDE EDGE OF SAID FABRIC BETWEEN SAID FOLDED OVER PORTION AND A PART OF SAID STRIP, SAID FOLDED OVER PORTIONS AND SAID PARTS EACH HAVING LONGITUDINALLY SPACED APART, TRANSVERSELY EXTENDING SLOTS, THE OUTLINE OF SAID SLOTS BEING DEFINED BY SHARP BURNED ELEMENTS EXTENDING BEYOND THE PLANE OF ONE FACE OF SAID STRIPS, SAID ONE FACE FORMING THE INSIDE OF SAID FOLD WHEREBY SAID BURRED ELEMENTS ARE DRIVEN INTO BOTH SURFACES OF SAID FABRIC UPON FORMATION OF SAID CLAMPING FOLD AND THEREBY AUGMENT THE ENGAGEMENT OF SAID STRIPS AND SAID FABRIC, SAID FABRIC, AFTER FOLDING OF SAID STRIPS, SERVING TO SEAL SAID SLOTS OF SAID STRIPS.
Claim 2
Dependent Claim
157 words
A FLEXIBLE DUCT CONNECTOR STOCK FOR JOINING THE EDGES OF DUCTS COMPRISING TWO ELONGATED SHEET METAL STRIPS AND A LENGTH OF DUCT SEALING FABRIC, SAID STRIPS EACH HAVIN A SIDE MARGINAL PORTION FOLDED OVER TOWARD THE STRIP AND CLAMPINGLY ENGAGING A DIFFERENT SIDE EDGE OF SAID LENGTH OF FABRIC TO SANDWICH SAID SIDE EDGE OF SAID FABRIC BETWEEN SAID FOLDED OVER PORTION AND A PART OF SAID STRIP, SAID FOLDED OVER PORTIONS AND SAID PARTS EACH HAVING LONGITUDINALLY SPACED APART, TRANSVERSELY EXTENDING SLOTS, THE OUTLINE OF SAID SLOTS BEING DEFINED BY SHARP BURNED ELEMENTS EXTENDING BEYOND THE PLANE OF ONE FACE OF SAID STRIPS, SAID ONE FACE FORMING THE INSIDE OF SAID FOLD WHEREBY SAID BURRED ELEMENTS ARE DRIVEN INTO BOTH SURFACES OF SAID FABRIC UPON FORMATION OF SAID CLAMPING FOLD AND THEREBY AUGMENT THE ENGAGEMENT OF SAID STRIPS AND SAID FABRIC, SAID FABRIC, AFTER FOLDING OF SAID STRIPS, SERVING TO SEAL SAID SLOTS OF SAID STRIPS.
References Cited (Backward Citations)
US410217A
Cited
US475656A
Cited
US583693A
Cited
US631376A
Cited
US1367792A
Cited
US1383469A
Cited
US1729159A
Cited
US1902111A
Cited
US1983700A
Cited
US1967191A
Cited
US2315640A
Cited
US2255156A
Cited
US2150412A
Cited
US2122925A
Cited
US2282482A
Cited
US2371816A
Cited
FR893703A
Cited
US2592335A
Cited
US2666657A
Cited
US2673003A
Cited
US2825384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |