Patent US3624340A successfully refreshed from Google Patents.
US3624340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attachment pin for connecting insulation to ducts by resistance welding
Assignee: Individual
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Filing: 1970-07-01
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Granted: 1971-11-30
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Expires: 1990-07-01
Abstract
Abstract An attachment pin for attaching insulating batts to metal by a resistance welding method comprising a shank terminating at one end in a lathe-sharpened tip, the opposite end of the shank incorporating a head portion, the cross-sectional area of which head portion is at least about 25 times the cross-sectional area of the shank.
Inventors
- 👤 Milton Hinden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:22
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; B23K11/004; B23K11/0046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
128 words
A welding pin for supporting insulative batts or the like to a metal substrate by resistance welding, comprising, in combination, a shank portion having a turn sharpened tip at one end and an enlarged head at the other end, said pin having a Rockwell C hardness in the range of from about 45 to about 50, the head of said pin having a cross-sectional area of at least about 20 times the cross-sectional area of the shank of said pin, whereby said enlarged head dissipates heat developed in the head adjacent areas of said shank, thus to maintain said head adjacent areas at least about 1500* cooler than the portions of said shank adjacent said tip when a welding current is passed through the length of said pin.
Claim 2
Dependent Claim
128 words
A welding pin for supporting insulative batts or the like to a metal substrate by resistance welding, comprising, in combination, a shank portion having a turn sharpened tip at one end and an enlarged head at the other end, said pin having a Rockwell C hardness in the range of from about 45 to about 50, the head of said pin having a cross-sectional area of at least about 20 times the cross-sectional area of the shank of said pin, whereby said enlarged head dissipates heat developed in the head adjacent areas of said shank, thus to maintain said head adjacent areas at least about 1500* cooler than the portions of said shank adjacent said tip when a welding current is passed through the length of said pin.
Claim 3
Dependent Claim
25 words
A welding pin in accordance with claim 1 wherein said tip is conical, the point defining an included angle of about 45* to about 50*.
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |