Patent US3357722A successfully refreshed from Google Patents.
US3357722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat sided duct connector
Assignee: McDonnell Douglas Corp
•
Filing: 1965-10-22
•
Granted: 1967-12-12
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Robert W Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:19
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A DUCT CONNECTOR CAPABLE OF CONNECTING TWO SEPARATE ALIGNED END DUCT SECTIONS IN A AIR-TIGHT UNIT COMPRISING: A SIDE DUCT CONNECTOR BEING FORMED OF A PLURALITY OF SIDEWALL PORTIONS, SAID SIDEWALL PORTIONS INCLUDING AN ARES SUBSTANTIALLY EQUAL TO THE AREA ENCLOSED BY SAID DUCT SECTIONS, SAID SIDEWALL PORTIONS BEING FLEXIBLE WHEREBY PRESSURE WITHIN SAID DUCT SECTIONS PHYSICALLY FORCE SAID FLEXIBLE SIDEWALL PORTIONS AGAINST SAID DUCT SECTIONS; CORNER PORTIONS CONNECTING TWO ADJACENT SIDEWALL SECTIONS, SAID CORNER PORTIONS HAVING MEANS TO SECURELY CLAMP SAID DUCT SECTIONS INTO A RIGID UNIT; AND SAID MEANS TO SECURELY CLAMP AND DUCT SECTIONS INCLUDES A BOTTOM PLATE PORTION, SAID BOTTOM PLATE PORTION BEING CONNECTED TO SAID SIDEWALL PORTIONS, A TOP PLATE PORTION MOUNTED EXTERIORLY OF SAID BOTTOM PLATE PORTION, PORTIONS OF SAID DUCTS ADAPTED TO EXTEND BETWEEN SAID TOP AND BOTTOM PLATE PORTIONS, MEANS CONNECTING SAID TOP AND BOTTOM PLATE PORTIONS AND CAPABLE OF FORCING TOGETHER SAID TOP PLATE PORTION AND SAID PORTIONS OF SAID DUCTS AND SAID BOTTOM PLATE PORTION THEREBY CREATING A CLAMPING FORCE.
Claim 2
Dependent Claim
170 words
A DUCT CONNECTOR CAPABLE OF CONNECTING TWO SEPARATE ALIGNED END DUCT SECTIONS IN A AIR-TIGHT UNIT COMPRISING: A SIDE DUCT CONNECTOR BEING FORMED OF A PLURALITY OF SIDEWALL PORTIONS, SAID SIDEWALL PORTIONS INCLUDING AN ARES SUBSTANTIALLY EQUAL TO THE AREA ENCLOSED BY SAID DUCT SECTIONS, SAID SIDEWALL PORTIONS BEING FLEXIBLE WHEREBY PRESSURE WITHIN SAID DUCT SECTIONS PHYSICALLY FORCE SAID FLEXIBLE SIDEWALL PORTIONS AGAINST SAID DUCT SECTIONS; CORNER PORTIONS CONNECTING TWO ADJACENT SIDEWALL SECTIONS, SAID CORNER PORTIONS HAVING MEANS TO SECURELY CLAMP SAID DUCT SECTIONS INTO A RIGID UNIT; AND SAID MEANS TO SECURELY CLAMP AND DUCT SECTIONS INCLUDES A BOTTOM PLATE PORTION, SAID BOTTOM PLATE PORTION BEING CONNECTED TO SAID SIDEWALL PORTIONS, A TOP PLATE PORTION MOUNTED EXTERIORLY OF SAID BOTTOM PLATE PORTION, PORTIONS OF SAID DUCTS ADAPTED TO EXTEND BETWEEN SAID TOP AND BOTTOM PLATE PORTIONS, MEANS CONNECTING SAID TOP AND BOTTOM PLATE PORTIONS AND CAPABLE OF FORCING TOGETHER SAID TOP PLATE PORTION AND SAID PORTIONS OF SAID DUCTS AND SAID BOTTOM PLATE PORTION THEREBY CREATING A CLAMPING FORCE.
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) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |